Added simple HTTPD server in C

1 files changed, 2818 insertions, 0 deletions

diff --git a/c-httpd/httpserver.h b/c-httpd/httpserver.h
new file mode 100644
index 0000000..26fb0c7
--- /dev/null
+++ b/c-httpd/httpserver.h
@@ -0,0 +1,2818 @@
+// httpserver.h has been automatically generated from httpserver.m4 and the
+// source files under /src
+#ifndef HTTPSERVER_H
+#define HTTPSERVER_H
+#line 1 "api.h"
+#ifndef HS_API_H
+#define HS_API_H
+/** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * @file api.h
+ *
+ * MIT License
+ *
+ * Copyright (c) 2019 Jeremy Williams
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *
+ * httpserver.h (0.9.0)
+ *
+ * Description:
+ *
+ *   A single header C library for building non-blocking event driven HTTP
+ *   servers
+ *
+ * Usage:
+ *
+ *   Do this:
+ *      #define HTTPSERVER_IMPL
+ *   before you include this file in *one* C or C++ file to create the
+ *   implementation.
+ *
+ *   // i.e. it should look like this:
+ *   #include ...
+ *   #include ...
+ *   #include ...
+ *   #define HTTPSERVER_IMPL
+ *   #include "httpserver.h"
+ *
+ *   There are some #defines that can be configured. This must be done in the
+ *   same file that you define HTTPSERVER_IMPL These defines have default values
+ *   and will need to be #undef'd and redefined to configure them.
+ *
+ *     HTTP_REQUEST_BUF_SIZE - default 1024 - The initial size in bytes of the
+ *       read buffer for the request. This buffer grows automatically if it's
+ *       capacity is reached but it certain environments it may be optimal to
+ *       change this value.
+ *
+ *     HTTP_RESPONSE_BUF_SIZE - default 1024 - Same as above except for the
+ *       response buffer.
+ *
+ *     HTTP_REQUEST_TIMEOUT - default 20 - The amount of seconds the request
+ * will wait for activity on the socket before closing. This only applies mid
+ *       request. For the amount of time to hold onto keep-alive connections see
+ *       below.
+ *
+ *     HTTP_KEEP_ALIVE_TIMEOUT - default 120 - The amount of seconds to keep a
+ *       connection alive a keep-alive request has completed.
+ *
+ *     HTTP_MAX_TOTAL_EST_MEM_USAGE - default 4294967296 (4GB) - This is the
+ *       amount of read/write buffer space that is allowed to be allocated
+ * across all requests before new requests will get 503 responses.
+ *
+ *     HTTP_MAX_TOKEN_LENGTH - default 8192 (8KB) - This is the max size of any
+ *       non body http tokens. i.e: header names, header values, url length,
+ * etc.
+ *
+ *     HTTP_MAX_REQUEST_BUF_SIZE - default 8388608 (8MB) - This is the maximum
+ *       amount of bytes that the request buffer will grow to. If the body of
+ * the request + headers cannot fit in this size the request body will be
+ *       streamed in.
+ *
+ *   For more details see the documentation of the interface and the example
+ *   below.
+ *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// String type used to read the request details. The char pointer is NOT null
+// terminated.
+struct http_string_s;
+
+struct http_server_s;
+struct http_request_s;
+struct http_response_s;
+
+/**
+ * Get the event loop descriptor that the server is running on.
+ *
+ * This will be an epoll fd when running on Linux or a kqueue on BSD. This can
+ * be used to listen for activity on sockets, etc. The only caveat is that the
+ * user data must be set to a struct where the first member is the function
+ * pointer to a callback that will handle the event. i.e:
+ *
+ * For kevent:
+ *
+ *   struct foo {
+ *     void (*handler)(struct kevent*);
+ *     ...
+ *   }
+ *
+ *   // Set ev.udata to a foo pointer when registering the event.
+ *
+ * For epoll:
+ *
+ *   struct foo {
+ *     void (*handler)(struct epoll_event*);
+ *     ...
+ *   }
+ *
+ *   // Set ev.data.ptr to a foo pointer when registering the event.
+ *
+ * @param server The server.
+ *
+ * @return The descriptor of the event loop.
+ */
+int http_server_loop(struct http_server_s *server);
+
+/**
+ * Allocates and initializes the http server.
+ *
+ * @param port The port to listen on.
+ * @param handler The callback that will fire to handle requests.
+ *
+ * @return Pointer to the allocated server.
+ */
+struct http_server_s *
+http_server_init(int port, void (*handler)(struct http_request_s *));
+
+/**
+ * Listens on the server socket and starts an event loop.
+ *
+ * During normal operation this function will not return.
+ *
+ * @param server The server.
+ * @param ipaddr The ip to bind to if NULL binds to all interfaces.
+ *
+ * @return Error code if the server fails.
+ */
+int http_server_listen_addr(struct http_server_s *server, const char *ipaddr);
+
+/**
+ * See http_server_listen_addr
+ */
+int http_server_listen(struct http_server_s *server);
+
+/**
+ * Poll the server socket on specific interface.
+ *
+ * Use this listen call in place of the one above when you want to integrate
+ * an http server into an existing application that has a loop already and you
+ * want to use the polling functionality instead. This works well for
+ * applications like games that have a constant update loop.
+ *
+ * @param server The server.
+ * @param ipaddr The ip to bind to if NULL bind to all.
+ *
+ * @return Error code if the poll fails.
+ */
+int http_server_listen_addr_poll(struct http_server_s *server,
+                                 const char *ipaddr);
+
+/**
+ * Poll the server socket on all interfaces. See http_server_listen_addr_poll
+ *
+ * @param server The server.
+ *
+ * @return Error code if the poll fails.
+ */
+int http_server_listen_poll(struct http_server_s *server);
+/**
+ * Poll of the request sockets.
+ *
+ * Call this function in your update loop. It will trigger the request handler
+ * once if there is a request ready. It should be called in a loop until it
+ * returns 0.
+ *
+ * @param server The server.
+ *
+ * @return Returns 1 if a request was handled and 0 if no requests were handled.
+ */
+int http_server_poll(struct http_server_s *server);
+
+/**
+ * Check if a request flag is set.
+ *
+ * The flags that can be queried are listed below:
+ *
+ * HTTP_FLG_STREAMED
+ *
+ *   This flag will be set when the request body is chunked or the body is too
+ *   large to fit in memory are once. This means that the
+ *   http_request_read_chunk function must be used to read the body piece by
+ *   piece.
+ *
+ * @param request The request.
+ * @param flag One of the flags listed above.
+ *
+ * @return 1 or 0 if the flag is set or not respectively.
+ */
+int http_request_has_flag(struct http_request_s *request, int flag);
+
+/**
+ * Returns the request method as it was read from the HTTP request line.
+ *
+ * @param request The request.
+ *
+ * @return The HTTP method.
+ */
+struct http_string_s http_request_method(struct http_request_s *request);
+
+/**
+ * Returns the full request target (url) from the HTTP request line.
+ *
+ * @param request The request.
+ *
+ * @return The target.
+ */
+struct http_string_s http_request_target(struct http_request_s *request);
+
+/**
+ * Retrieves the request body.
+ *
+ * @param request The request.
+ *
+ * @return The request body. If no request body was sent buf and len of the
+ *   string will be set to 0.
+ */
+struct http_string_s http_request_body(struct http_request_s *request);
+
+/**
+ * Returns the request header value for the given header key.
+ *
+ * @param request The request.
+ * @param key The case insensitive header key to search for.
+ *
+ * @return The value for the header matching the key. Will be length 0 if not
+ *   found.
+ */
+struct http_string_s http_request_header(struct http_request_s *request,
+                                         char const *key);
+
+/**
+ * Iterate over the request headers.
+ *
+ * Each call will set key and val to the key and value of the next header.
+ *
+ * @param request The request.
+ * @param[out] key The key of the header.
+ * @param[out] value The key of the header.
+ * @param[inout] iter Should be initialized to 0 before calling. Pass back in
+ *   with each consecutive call.
+ *
+ * @return 0 when there are no more headers.
+ */
+int http_request_iterate_headers(struct http_request_s *request,
+                                 struct http_string_s *key,
+                                 struct http_string_s *val, int *iter);
+
+/**
+ * Stores an arbitrary userdata pointer for this request.
+ *
+ * This is not used by the library in any way and is strictly for you, the
+ * application programmer to make use of.
+ *
+ * @param request The request.
+ * @param data Opaque pointer to user data.
+ */
+void http_request_set_userdata(struct http_request_s *request, void *data);
+
+/**
+ * Retrieve the opaque data pointer that was set with http_request_set_userdata.
+ *
+ * @param request The request.
+ */
+void *http_request_userdata(struct http_request_s *request);
+
+/**
+ * Stores a server wide opaque pointer for future retrieval.
+ *
+ * This is not used by the library in any way and is strictly for you, the
+ * application programmer to make use of.
+ *
+ * @param server The server.
+ * @param data Opaque data pointer.
+ */
+void http_server_set_userdata(struct http_server_s *server, void *data);
+
+/**
+ * Retrieve the server wide userdata pointer.
+ *
+ * @param request The request.
+ */
+void *http_request_server_userdata(struct http_request_s *request);
+
+/**
+ * Sets how the request will handle it's connection
+ *
+ * By default the server will inspect the Connection header and the HTTP
+ * version to determine whether the connection should be kept alive or not.
+ * Use this function to override that behaviour to force the connection to
+ * keep-alive or close by passing in the HTTP_KEEP_ALIVE or HTTP_CLOSE
+ * directives respectively. This may provide a minor performance improvement
+ * in cases where you control client and server and want to always close or
+ * keep the connection alive.
+ *
+ * @param request The request.
+ * @param directive One of HTTP_KEEP_ALIVE or HTTP_CLOSE
+ */
+void http_request_connection(struct http_request_s *request, int directive);
+
+/**
+ * Frees the buffer of a request.
+ *
+ * When reading in the HTTP request the server allocates a buffer to store
+ * the request details such as the headers, method, body, etc. By default this
+ * memory will be freed when http_respond is called. This function lets you
+ * free that memory before the http_respond call. This can be useful if you
+ * have requests that take a long time to complete and you don't require the
+ * request data. Accessing any http_string_s's will be invalid after this call.
+ *
+ * @param request The request to free the buffer of.
+ */
+void http_request_free_buffer(struct http_request_s *request);
+
+/**
+ * Allocates an http response.
+ *
+ * This memory will be freed when http_respond is called.
+ *
+ * @return Allocated response.
+ */
+struct http_response_s *http_response_init();
+
+/**
+ * Set the response status.
+ *
+ * Accepts values between 100 and 599 inclusive. Any other value will map to
+ * 500.
+ *
+ * @param response The response struct to set status on.
+ * @param status The HTTP status code.
+ */
+void http_response_status(struct http_response_s *response, int status);
+
+/**
+ * Sets an HTTP response header.
+ *
+ * @param response The response struct to set the header on.
+ * @param key The null-terminated key of the header eg: Content-Type
+ * @param value The null-terminated value of the header eg: application/json
+ */
+void http_response_header(struct http_response_s *response, char const *key,
+                          char const *value);
+
+/**
+ * Set the response body.
+ *
+ * The caller is responsible for freeing any memory that
+ * may have been allocated for the body. It is safe to free this memory AFTER
+ * http_respond has been called. If responding with chunked transfer encoding
+ * this will become a single chunk. This procedure can be used again to set
+ * subsequent chunks.
+ *
+ * @param response The response struct to set the body for.
+ * @param body The body of the response.
+ * @param length The length of the body
+ */
+void http_response_body(struct http_response_s *response, char const *body,
+                        int length);
+
+/**
+ * Starts writing the response to the client.
+ *
+ * Any memory allocated for the response body or response headers is safe to
+ * free after this call. Adds the default HTTP response headers, Date and
+ * Connection.
+ *
+ * @param request The request to respond to.
+ * @param response The response to respond with.
+ */
+void http_respond(struct http_request_s *request,
+                  struct http_response_s *response);
+
+/**
+ * Writes a chunk to the client.
+ *
+ * The notify_done callback will be called when the write is complete. This call
+ * consumes the response so a new response will need to be initialized for each
+ * chunk. The response status of the request will be the response status that is
+ * set when http_respond_chunk is called the first time. Any headers set for the
+ * first call will be sent as the response headers. Transfer-Encoding header
+ * will automatically be set to chunked. Headers set for subsequent calls will
+ * be ignored.
+ *
+ * @param request The request to respond to.
+ * @param response The response to respond with.
+ * @param notify_done The callback that's used to signal user code that another
+ *   chunk is ready to be written out.
+ */
+void http_respond_chunk(struct http_request_s *request,
+                        struct http_response_s *response,
+                        void (*notify_done)(struct http_request_s *));
+
+/**
+ * Ends the chunked response.
+ *
+ * Used to signal end of transmission on chunked requests. Any headers set
+ * before this call will be included as what the HTTP spec refers to as
+ * 'trailers' which are essentially more response headers.
+ *
+ * @param request The request to respond to.
+ * @param response  The response to respond with.
+ */
+void http_respond_chunk_end(struct http_request_s *request,
+                            struct http_response_s *response);
+
+/**
+ * Read a chunk of the request body.
+ *
+ * If a request has Transfer-Encoding: chunked or the body is too big to fit in
+ * memory all at once you cannot read the body in the typical way. Instead you
+ * need to call this function to read one chunk at a time. To check if the
+ * request requires this type of reading you can call the http_request_has_flag
+ * function to check if the HTTP_FLG_STREAMED flag is set. To read a streamed
+ * body you pass a callback that will be called when the chunk is ready. When
+ * the callback is called you can use 'http_request_chunk' to get the current
+ * chunk. When done with that chunk call this function again to request the
+ * next chunk. If the chunk has size 0 then the request body has been completely
+ * read and you can now respond.
+ *
+ * @param request The request.
+ * @param chunk_cb Callback for when the chunk is ready.
+ */
+void http_request_read_chunk(struct http_request_s *request,
+                             void (*chunk_cb)(struct http_request_s *));
+
+/**
+ * Returns the current chunk of the request body.
+ *
+ * This chunk is only valid until the next call to 'http_request_read_chunk'.
+ *
+ * @param request The request.
+ *
+ * @return The chunk data.
+ */
+struct http_string_s http_request_chunk(struct http_request_s *request);
+
+#define http_request_read_body http_request_read_chunk
+
+#ifdef __cplusplus
+}
+#endif
+
+// Minimal example usage.
+#ifdef HTTPSERVER_EXAMPLE
+
+#define RESPONSE "Hello, World!"
+
+void handle_request(struct http_request_s *request) {
+  struct http_response_s *response = http_response_init();
+  http_response_status(response, 200);
+  http_response_header(response, "Content-Type", "text/plain");
+  http_response_body(response, RESPONSE, sizeof(RESPONSE) - 1);
+  http_respond(request, response);
+}
+
+int main() {
+  struct http_server_s *server = http_server_init(8080, handle_request);
+  http_server_listen(server);
+}
+
+#endif
+
+#endif
+
+#line 1 "common.h"
+#ifndef HS_COMMON_H
+#define HS_COMMON_H
+
+// http session states
+#define HTTP_SESSION_INIT 0
+#define HTTP_SESSION_READ 1
+#define HTTP_SESSION_WRITE 2
+#define HTTP_SESSION_NOP 3
+
+#define HTTP_REQUEST_TIMEOUT 20
+
+#define HTTP_FLAG_SET(var, flag) var |= flag
+#define HTTP_FLAG_CLEAR(var, flag) var &= ~flag
+#define HTTP_FLAG_CHECK(var, flag) (var & flag)
+
+#define HTTP_AUTOMATIC 0x8
+#define HTTP_CHUNKED_RESPONSE 0x20
+
+#define HTTP_KEEP_ALIVE 1
+#define HTTP_CLOSE 0
+
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#ifdef KQUEUE
+#include <sys/event.h>
+#else
+#include <sys/epoll.h>
+#endif
+
+#ifdef EPOLL
+typedef void (*epoll_cb_t)(struct epoll_event *);
+#endif
+
+typedef struct http_ev_cb_s {
+#ifdef KQUEUE
+  void (*handler)(struct kevent *ev);
+#else
+  epoll_cb_t handler;
+#endif
+} ev_cb_t;
+
+struct hsh_buffer_s {
+  char *buf;
+  int32_t capacity;
+  int32_t length;
+  int32_t index;
+  int32_t after_headers_index;
+  int8_t sequence_id;
+};
+
+enum hsh_token_e {
+  HSH_TOK_METHOD,
+  HSH_TOK_TARGET,
+  HSH_TOK_VERSION,
+  HSH_TOK_HEADER_KEY,
+  HSH_TOK_HEADER_VALUE,
+  HSH_TOK_HEADERS_DONE,
+  HSH_TOK_BODY,
+  HSH_TOK_NONE,
+  HSH_TOK_ERR
+};
+
+struct hsh_token_s {
+  enum hsh_token_e type;
+  uint8_t flags;
+  int len;
+  int index;
+};
+
+struct hsh_parser_s {
+  int64_t content_length;
+  int64_t content_remaining;
+  struct hsh_token_s token;
+  int16_t limit_count;
+  int16_t limit_max;
+  int8_t state;
+  int8_t flags;
+  int8_t sequence_id;
+};
+
+struct hs_token_array_s {
+  struct hsh_token_s *buf;
+  int capacity;
+  int size;
+};
+
+typedef struct http_request_s {
+#ifdef KQUEUE
+  void (*handler)(struct kevent *ev);
+#else
+  epoll_cb_t handler;
+  epoll_cb_t timer_handler;
+  int timerfd;
+#endif
+  void (*chunk_cb)(struct http_request_s *);
+  void *data;
+  struct hsh_buffer_s buffer;
+  struct hsh_parser_s parser;
+  struct hs_token_array_s tokens;
+  int state;
+  int socket;
+  int timeout;
+  int64_t bytes_written;
+  struct http_server_s *server;
+  char flags;
+} http_request_t;
+
+typedef struct http_server_s {
+#ifdef KQUEUE
+  void (*handler)(struct kevent *ev);
+#else
+  epoll_cb_t handler;
+  epoll_cb_t timer_handler;
+#endif
+  int64_t memused;
+  int socket;
+  int port;
+  int loop;
+  int timerfd;
+  socklen_t len;
+  void (*request_handler)(http_request_t *);
+  struct sockaddr_in addr;
+  void *data;
+  char date[32];
+} http_server_t;
+
+#endif
+
+#line 1 "buffer_util.h"
+#ifndef HS_BUFFER_UTIL_H
+#define HS_BUFFER_UTIL_H
+
+#include <stdlib.h>
+
+#ifndef HTTPSERVER_IMPL
+// #include "common.h"
+#endif
+
+static inline void _hs_buffer_free(struct hsh_buffer_s *buffer,
+                                   int64_t *memused) {
+  if (buffer->buf) {
+    free(buffer->buf);
+    *memused -= buffer->capacity;
+    buffer->buf = NULL;
+  }
+}
+
+#endif
+
+#line 1 "request_util.h"
+#ifndef HS_REQUEST_UTIL_H
+#define HS_REQUEST_UTIL_H
+
+// #include "common.h"
+
+// http version indicators
+#define HTTP_1_0 0
+#define HTTP_1_1 1
+
+struct http_string_s {
+  char const *buf;
+  int len;
+};
+
+typedef struct http_string_s http_string_t;
+
+http_string_t hs_get_token_string(http_request_t *request,
+                                  enum hsh_token_e token_type);
+http_string_t hs_request_header(http_request_t *request, char const *key);
+void hs_request_detect_keep_alive_flag(http_request_t *request);
+int hs_request_iterate_headers(http_request_t *request, http_string_t *key,
+                               http_string_t *val, int *iter);
+void hs_request_set_keep_alive_flag(http_request_t *request, int directive);
+http_string_t hs_request_chunk(struct http_request_s *request);
+
+#endif
+
+#line 1 "parser.h"
+#ifndef HTTP_PARSER_H
+#define HTTP_PARSER_H
+
+// HSH_TOK_HEADERS_DONE flags
+#define HSH_TOK_FLAG_NO_BODY 0x1
+#define HSH_TOK_FLAG_STREAMED_BODY 0x2
+
+// HSH_TOK_BODY flags
+#define HSH_TOK_FLAG_BODY_FINAL 0x1
+#define HSH_TOK_FLAG_SMALL_BODY 0x2
+
+struct hsh_token_s hsh_parser_exec(struct hsh_parser_s *parser,
+                                   struct hsh_buffer_s *buffer,
+                                   int max_buf_capacity);
+void hsh_parser_init(struct hsh_parser_s *parser);
+
+#endif
+
+#line 1 "read_socket.h"
+#ifndef HS_READ_SOCKET_H
+#define HS_READ_SOCKET_H
+
+#define HTTP_FLG_STREAMED 0x1
+
+#include <stdint.h>
+
+struct http_request_s;
+
+// Response code for hs_read_socket
+enum hs_read_rc_e {
+  // Execution was successful
+  HS_READ_RC_SUCCESS,
+  // There was an error parsing the HTTP request
+  HS_READ_RC_PARSE_ERR,
+  // There was an error reading the socket
+  HS_READ_RC_SOCKET_ERR
+};
+
+// Holds configuration options for the hs_read_socket procedure.
+struct hs_read_opts_s {
+  // Restricts the request buffer from ever growing larger than this size
+  int64_t max_request_buf_capacity;
+  // The value to be compared to the return of the read call to determine if
+  // the connection has been closed. Should generally be 0 in normal operation
+  // using sockets but can be useful to change if you want to use files instead
+  // of sockets for testing.
+  int eof_rc;
+  // The initial capacity that is allocated for the request buffer
+  int initial_request_buf_capacity;
+};
+
+enum hs_read_rc_e
+hs_read_request_and_exec_user_cb(struct http_request_s *request,
+                                 struct hs_read_opts_s opts);
+
+#endif
+
+#line 1 "respond.h"
+#ifndef HS_RESPOND_H
+#define HS_RESPOND_H
+
+#define HTTP_RESPONSE_BUF_SIZE 1024
+
+struct http_request_s;
+
+typedef void (*hs_req_fn_t)(struct http_request_s *);
+
+// Represents a single header of an HTTP response.
+typedef struct http_header_s {
+  // The key of the header eg: Content-Type
+  char const *key;
+  // The value of the header eg: application/json
+  char const *value;
+  // Pointer to the next header in the linked list.
+  struct http_header_s *next;
+} http_header_t;
+
+// Represents the response of an HTTP request before it is serialized on the
+// wire.
+typedef struct http_response_s {
+  // Head of the linked list of response headers
+  http_header_t *headers;
+  // The complete body of the response or the chunk if generating a chunked
+  // response.
+  char const *body;
+  // The length of the body or chunk.
+  int content_length;
+  // The HTTP status code for the response.
+  int status;
+} http_response_t;
+
+http_response_t *hs_response_init();
+void hs_response_set_header(http_response_t *response, char const *key,
+                            char const *value);
+void hs_response_set_status(http_response_t *response, int status);
+void hs_response_set_body(http_response_t *response, char const *body,
+                          int length);
+void hs_request_respond(struct http_request_s *request,
+                        http_response_t *response, hs_req_fn_t http_write);
+void hs_request_respond_chunk(struct http_request_s *request,
+                              http_response_t *response, hs_req_fn_t cb,
+                              hs_req_fn_t http_write);
+void hs_request_respond_chunk_end(struct http_request_s *request,
+                                  http_response_t *response,
+                                  hs_req_fn_t http_write);
+void hs_request_respond_error(struct http_request_s *request, int code,
+                              char const *message, hs_req_fn_t http_write);
+
+#endif
+
+#line 1 "server.h"
+#ifndef HS_SERVER_H
+#define HS_SERVER_H
+
+#ifdef KQUEUE
+
+struct kevent;
+
+typedef void (*hs_evt_cb_t)(struct kevent *ev);
+
+#else
+
+struct epoll_event;
+
+typedef void (*hs_evt_cb_t)(struct epoll_event *ev);
+
+#endif
+
+struct http_request_s;
+struct http_server_s;
+
+void hs_server_listen_on_addr(struct http_server_s *serv, const char *ipaddr);
+int hs_server_run_event_loop(struct http_server_s *serv, const char *ipaddr);
+void hs_generate_date_time(char *datetime);
+struct http_server_s *hs_server_init(int port,
+                                     void (*handler)(struct http_request_s *),
+                                     hs_evt_cb_t accept_cb,
+                                     hs_evt_cb_t timer_cb);
+int hs_server_poll_events(struct http_server_s *serv);
+
+#endif
+
+#line 1 "write_socket.h"
+#ifndef HS_WRITE_SOCKET_H
+#define HS_WRITE_SOCKET_H
+
+#define HTTP_KEEP_ALIVE_TIMEOUT 120
+
+struct http_request_s;
+
+// Response code for hs_write_socket
+enum hs_write_rc_e {
+  // Successful and has written the full response
+  HS_WRITE_RC_SUCCESS,
+  // Successful and has written the full chunk
+  HS_WRITE_RC_SUCCESS_CHUNK,
+  // Successful, has written the full response and the socket should be closed
+  HS_WRITE_RC_SUCCESS_CLOSE,
+  // Successful but has not written the full response, wait for write ready
+  HS_WRITE_RC_CONTINUE,
+  // Error writing to the socket
+  HS_WRITE_RC_SOCKET_ERR
+};
+
+enum hs_write_rc_e hs_write_socket(struct http_request_s *request);
+
+#endif
+
+#line 1 "connection.h"
+#ifndef HS_CONNECTION_H
+#define HS_CONNECTION_H
+
+// Forward declarations
+struct http_request_s;
+struct http_server_s;
+
+#ifdef KQUEUE
+struct kevent;
+typedef void (*hs_io_cb_t)(struct kevent *ev);
+#else
+struct epoll_event;
+typedef void (*hs_io_cb_t)(struct epoll_event *ev);
+#endif
+
+/* Closes the requests socket and frees its resources.
+ *
+ * Removes all event watchers from the request socket and frees any allocated
+ * buffers associated with the request struct.
+ *
+ * @param request The request to close
+ */
+void hs_request_terminate_connection(struct http_request_s *request);
+
+/* Accepts connections on the server socket in a loop until it would block.
+ *
+ * When a connection is accepted a request struct is allocated and initialized
+ * and the request socket is set to non-blocking mode. Event watchers are set
+ * on the socket to call io_cb with a read/write ready event occurs. If the
+ * server has reached max_mem_usage the err_responder function is called to
+ * handle the issue.
+ *
+ * @param server The http server struct.
+ * @param io_cb The callback function to respond to events on the request socket
+ * @param epoll_timer_cb The callback function to respond to timer events for
+ *   epoll. Can be NULL if not using epoll.
+ * @param err_responder The procedure to call when memory usage has reached the
+ *   given limit. Typically this could respond with a 503 error and close the
+ *   connection.
+ * @param max_mem_usage The limit at which err_responder should be called
+ *   instead of regular operation.
+ */
+struct http_request_s *hs_server_accept_connection(struct http_server_s *server,
+                                                   hs_io_cb_t io_cb,
+                                                   hs_io_cb_t epoll_timer_cb);
+
+#endif
+
+#line 1 "io_events.h"
+#ifndef HS_IO_EVENTS_H
+#define HS_IO_EVENTS_H
+
+#define HTTP_REQUEST_BUF_SIZE 1024
+#define HTTP_MAX_REQUEST_BUF_SIZE 8388608       // 8mb
+#define HTTP_MAX_TOTAL_EST_MEM_USAGE 4294967296 // 4gb
+
+struct http_request_s;
+
+void hs_request_begin_write(struct http_request_s *request);
+void hs_request_begin_read(struct http_request_s *request);
+
+#ifdef KQUEUE
+
+struct kevent;
+
+void hs_on_kqueue_server_event(struct kevent *ev);
+
+#else
+
+struct epoll_event;
+
+void hs_on_epoll_server_connection_event(struct epoll_event *ev);
+void hs_on_epoll_server_timer_event(struct epoll_event *ev);
+
+#endif
+
+#endif
+
+#ifdef HTTPSERVER_IMPL
+#ifndef HTTPSERVER_IMPL_ONCE
+#define HTTPSERVER_IMPL_ONCE
+#line 1 "api.c"
+#include <stdlib.h>
+
+#ifndef HTTPSERVER_IMPL
+#include "api.h"
+#include "buffer_util.h"
+#include "common.h"
+#include "io_events.h"
+#include "request_util.h"
+#include "respond.h"
+#include "server.h"
+#endif
+
+int http_request_has_flag(http_request_t *request, int flag) {
+  return HTTP_FLAG_CHECK(request->flags, flag);
+}
+
+int http_server_loop(http_server_t *server) { return server->loop; }
+
+http_server_t *http_server_init(int port, void (*handler)(http_request_t *)) {
+#ifdef KQUEUE
+  return hs_server_init(port, handler, hs_on_kqueue_server_event, NULL);
+#else
+  return hs_server_init(port, handler, hs_on_epoll_server_connection_event,
+                        hs_on_epoll_server_timer_event);
+#endif
+}
+
+void http_request_free_buffer(http_request_t *request) {
+  _hs_buffer_free(&request->buffer, &request->server->memused);
+}
+
+void *http_request_userdata(http_request_t *request) { return request->data; }
+
+void http_request_set_userdata(http_request_t *request, void *data) {
+  request->data = data;
+}
+
+void http_server_set_userdata(struct http_server_s *serv, void *data) {
+  serv->data = data;
+}
+
+void *http_request_server_userdata(struct http_request_s *request) {
+  return request->server->data;
+}
+
+int http_request_iterate_headers(http_request_t *request, http_string_t *key,
+                                 http_string_t *val, int *iter) {
+  return hs_request_iterate_headers(request, key, val, iter);
+}
+
+http_string_t http_request_header(http_request_t *request, char const *key) {
+  return hs_request_header(request, key);
+}
+
+void http_request_connection(http_request_t *request, int directive) {
+  hs_request_set_keep_alive_flag(request, directive);
+}
+
+http_string_t http_request_chunk(struct http_request_s *request) {
+  return hs_request_chunk(request);
+}
+
+http_response_t *http_response_init() { return hs_response_init(); }
+
+void http_response_header(http_response_t *response, char const *key,
+                          char const *value) {
+  return hs_response_set_header(response, key, value);
+}
+
+void http_response_status(http_response_t *response, int status) {
+  hs_response_set_status(response, status);
+}
+
+void http_response_body(http_response_t *response, char const *body,
+                        int length) {
+  hs_response_set_body(response, body, length);
+}
+
+void http_respond(http_request_t *request, http_response_t *response) {
+  hs_request_respond(request, response, hs_request_begin_write);
+}
+
+void http_respond_chunk(http_request_t *request, http_response_t *response,
+                        void (*cb)(http_request_t *)) {
+  hs_request_respond_chunk(request, response, cb, hs_request_begin_write);
+}
+
+void http_respond_chunk_end(http_request_t *request,
+                            http_response_t *response) {
+  hs_request_respond_chunk_end(request, response, hs_request_begin_write);
+}
+
+http_string_t http_request_method(http_request_t *request) {
+  return hs_get_token_string(request, HSH_TOK_METHOD);
+}
+
+http_string_t http_request_target(http_request_t *request) {
+  return hs_get_token_string(request, HSH_TOK_TARGET);
+}
+
+http_string_t http_request_body(http_request_t *request) {
+  return hs_get_token_string(request, HSH_TOK_BODY);
+}
+
+int http_server_listen(http_server_t *serv) {
+  return hs_server_run_event_loop(serv, NULL);
+}
+
+int http_server_listen_addr(http_server_t *serv, const char *ipaddr) {
+  return hs_server_run_event_loop(serv, ipaddr);
+}
+
+int http_server_poll(http_server_t *serv) {
+  return hs_server_poll_events(serv);
+}
+
+int http_server_listen_poll(http_server_t *serv) {
+  hs_server_listen_on_addr(serv, NULL);
+  return 0;
+}
+
+int http_server_listen_addr_poll(http_server_t *serv, const char *ipaddr) {
+  hs_server_listen_on_addr(serv, ipaddr);
+  return 0;
+}
+
+void http_request_read_chunk(struct http_request_s *request,
+                             void (*chunk_cb)(struct http_request_s *)) {
+  request->state = HTTP_SESSION_READ;
+  request->chunk_cb = chunk_cb;
+  hs_request_begin_read(request);
+}
+
+#line 1 "request_util.c"
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef HTTPSERVER_IMPL
+#include "common.h"
+#include "request_util.h"
+#endif
+
+int _hs_case_insensitive_cmp(char const *a, char const *b, int len) {
+  for (int i = 0; i < len; i++) {
+    char c1 = a[i] >= 'A' && a[i] <= 'Z' ? a[i] + 32 : a[i];
+    char c2 = b[i] >= 'A' && b[i] <= 'Z' ? b[i] + 32 : b[i];
+    if (c1 != c2)
+      return 0;
+  }
+  return 1;
+}
+
+http_string_t hs_get_token_string(http_request_t *request,
+                                  enum hsh_token_e token_type) {
+  http_string_t str = {0, 0};
+  if (request->tokens.buf == NULL)
+    return str;
+  for (int i = 0; i < request->tokens.size; i++) {
+    struct hsh_token_s token = request->tokens.buf[i];
+    if (token.type == token_type) {
+      str.buf = &request->buffer.buf[token.index];
+      str.len = token.len;
+      return str;
+    }
+  }
+  return str;
+}
+
+http_string_t hs_request_header(http_request_t *request, char const *key) {
+  int len = strlen(key);
+  for (int i = 0; i < request->tokens.size; i++) {
+    struct hsh_token_s token = request->tokens.buf[i];
+    if (token.type == HSH_TOK_HEADER_KEY && token.len == len) {
+      if (_hs_case_insensitive_cmp(&request->buffer.buf[token.index], key,
+                                   len)) {
+        token = request->tokens.buf[i + 1];
+        return (http_string_t){.buf = &request->buffer.buf[token.index],
+                               .len = token.len};
+      }
+    }
+  }
+  return (http_string_t){};
+}
+
+void hs_request_detect_keep_alive_flag(http_request_t *request) {
+  http_string_t str = hs_get_token_string(request, HSH_TOK_VERSION);
+  if (str.buf == NULL)
+    return;
+  int version = str.buf[str.len - 1] == '1';
+  str = hs_request_header(request, "Connection");
+  if ((str.len == 5 && _hs_case_insensitive_cmp(str.buf, "close", 5)) ||
+      (str.len == 0 && version == HTTP_1_0)) {
+    HTTP_FLAG_CLEAR(request->flags, HTTP_KEEP_ALIVE);
+  } else {
+    HTTP_FLAG_SET(request->flags, HTTP_KEEP_ALIVE);
+  }
+}
+
+int _hs_get_header_key_val(http_request_t *request, http_string_t *key,
+                           http_string_t *val, int iter) {
+  struct hsh_token_s token = request->tokens.buf[iter];
+  if (request->tokens.buf[iter].type == HSH_TOK_HEADERS_DONE)
+    return 0;
+  *key = (http_string_t){.buf = &request->buffer.buf[token.index],
+                         .len = token.len};
+  token = request->tokens.buf[iter + 1];
+  *val = (http_string_t){.buf = &request->buffer.buf[token.index],
+                         .len = token.len};
+  return 1;
+}
+
+int hs_request_iterate_headers(http_request_t *request, http_string_t *key,
+                               http_string_t *val, int *iter) {
+  if (*iter == 0) {
+    for (; *iter < request->tokens.size; (*iter)++) {
+      struct hsh_token_s token = request->tokens.buf[*iter];
+      if (token.type == HSH_TOK_HEADER_KEY) {
+        int more = _hs_get_header_key_val(request, key, val, *iter);
+        (*iter)++;
+        return more;
+      }
+    }
+    return 0;
+  } else {
+    (*iter)++;
+    int more = _hs_get_header_key_val(request, key, val, *iter);
+    (*iter)++;
+    return more;
+  }
+}
+
+void hs_request_set_keep_alive_flag(http_request_t *request, int directive) {
+  if (directive == HTTP_KEEP_ALIVE) {
+    HTTP_FLAG_CLEAR(request->flags, HTTP_AUTOMATIC);
+    HTTP_FLAG_SET(request->flags, HTTP_KEEP_ALIVE);
+  } else if (directive == HTTP_CLOSE) {
+    HTTP_FLAG_CLEAR(request->flags, HTTP_AUTOMATIC);
+    HTTP_FLAG_CLEAR(request->flags, HTTP_KEEP_ALIVE);
+  }
+}
+
+http_string_t hs_request_chunk(struct http_request_s *request) {
+  struct hsh_token_s token = request->tokens.buf[request->tokens.size - 1];
+  return (http_string_t){.buf = &request->buffer.buf[token.index],
+                         .len = token.len};
+}
+
+#line 1 "parser.c"
+
+#line 1 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+#include <string.h>
+#include <stdlib.h>
+
+#ifndef HTTPSERVER_IMPL
+#include "common.h"
+#include "parser.h"
+#endif
+
+#define HSH_P_FLAG_CHUNKED 0x1
+#define HSH_P_FLAG_TOKEN_READY 0x2
+#define HSH_P_FLAG_DONE 0x4
+
+#define HSH_ENTER_TOKEN(tok_type, max_len) \
+  parser->token.type = tok_type; \
+  parser->token.index = p - buffer->buf; \
+  parser->token.flags = 0; \
+  parser->limit_count = 0; \
+  parser->limit_max = max_len;
+
+
+#line 232 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+
+
+
+#line 28 "/Users/jeremywilliams/code/httpserver.h/build/src/parser.c"
+static const char _hsh_http_actions[] = {
+        0, 1, 2, 1, 6, 1, 10, 1, 
+        13, 1, 14, 1, 15, 1, 16, 1, 
+        17, 1, 18, 2, 0, 10, 2, 1, 
+        10, 2, 4, 10, 2, 5, 14, 2, 
+        5, 16, 2, 5, 17, 2, 7, 10, 
+        2, 8, 10, 2, 10, 11, 2, 12, 
+        13, 2, 13, 14, 3, 3, 9, 10, 
+        3, 4, 10, 6, 3, 7, 4, 10, 
+        3, 9, 3, 10, 3, 13, 5, 14, 
+        3, 13, 14, 12, 3, 14, 12, 13, 
+        4, 5, 14, 12, 13, 4, 13, 5, 
+        14, 12, 4, 14, 12, 13, 15
+};
+
+static const short _hsh_http_key_offsets[] = {
+        0, 0, 4, 9, 10, 11, 12, 13, 
+        14, 15, 16, 17, 18, 20, 21, 22, 
+        39, 53, 55, 58, 60, 61, 79, 94, 
+        110, 126, 142, 158, 174, 190, 205, 221, 
+        237, 253, 269, 285, 301, 315, 317, 322, 
+        324, 328, 344, 360, 376, 392, 408, 424, 
+        440, 455, 471, 487, 503, 519, 535, 551, 
+        567, 583, 597, 599, 603, 606, 609, 612, 
+        615, 618, 621, 622, 623, 624, 631, 632, 
+        632, 633, 634, 635, 642, 643, 643, 644, 
+        652, 661, 669, 677, 686, 688, 697, 698, 
+        699, 699, 699, 713, 713, 713, 721, 729, 
+        729, 729
+};
+
+static const char _hsh_http_trans_keys[] = {
+        65, 90, 97, 122, 32, 65, 90, 97, 
+        122, 32, 32, 72, 84, 84, 80, 47, 
+        49, 46, 48, 49, 13, 10, 9, 32, 
+        34, 44, 47, 67, 84, 99, 116, 123, 
+        125, 40, 41, 58, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 9, 
+        13, 32, 10, 13, 10, 9, 13, 32, 
+        34, 44, 47, 67, 84, 99, 116, 123, 
+        125, 40, 41, 58, 64, 91, 93, 9, 
+        10, 32, 34, 44, 47, 58, 123, 125, 
+        40, 41, 59, 64, 91, 93, 9, 32, 
+        34, 44, 47, 58, 79, 111, 123, 125, 
+        40, 41, 59, 64, 91, 93, 9, 32, 
+        34, 44, 47, 58, 78, 110, 123, 125, 
+        40, 41, 59, 64, 91, 93, 9, 32, 
+        34, 44, 47, 58, 84, 116, 123, 125, 
+        40, 41, 59, 64, 91, 93, 9, 32, 
+        34, 44, 47, 58, 69, 101, 123, 125, 
+        40, 41, 59, 64, 91, 93, 9, 32, 
+        34, 44, 47, 58, 78, 110, 123, 125, 
+        40, 41, 59, 64, 91, 93, 9, 32, 
+        34, 44, 47, 58, 84, 116, 123, 125, 
+        40, 41, 59, 64, 91, 93, 9, 32, 
+        34, 44, 45, 47, 58, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 34, 
+        44, 47, 58, 76, 108, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 34, 
+        44, 47, 58, 69, 101, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 34, 
+        44, 47, 58, 78, 110, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 34, 
+        44, 47, 58, 71, 103, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 34, 
+        44, 47, 58, 84, 116, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 34, 
+        44, 47, 58, 72, 104, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 34, 
+        44, 47, 58, 123, 125, 40, 41, 59, 
+        64, 91, 93, 9, 32, 9, 13, 32, 
+        48, 57, 10, 13, 10, 13, 48, 57, 
+        9, 32, 34, 44, 47, 58, 82, 114, 
+        123, 125, 40, 41, 59, 64, 91, 93, 
+        9, 32, 34, 44, 47, 58, 65, 97, 
+        123, 125, 40, 41, 59, 64, 91, 93, 
+        9, 32, 34, 44, 47, 58, 78, 110, 
+        123, 125, 40, 41, 59, 64, 91, 93, 
+        9, 32, 34, 44, 47, 58, 83, 115, 
+        123, 125, 40, 41, 59, 64, 91, 93, 
+        9, 32, 34, 44, 47, 58, 70, 102, 
+        123, 125, 40, 41, 59, 64, 91, 93, 
+        9, 32, 34, 44, 47, 58, 69, 101, 
+        123, 125, 40, 41, 59, 64, 91, 93, 
+        9, 32, 34, 44, 47, 58, 82, 114, 
+        123, 125, 40, 41, 59, 64, 91, 93, 
+        9, 32, 34, 44, 45, 47, 58, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 69, 101, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 78, 110, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 67, 99, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 79, 111, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 68, 100, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 73, 105, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 78, 110, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 71, 103, 123, 
+        125, 40, 41, 59, 64, 91, 93, 9, 
+        32, 34, 44, 47, 58, 123, 125, 40, 
+        41, 59, 64, 91, 93, 9, 32, 9, 
+        13, 32, 99, 10, 13, 104, 10, 13, 
+        117, 10, 13, 110, 10, 13, 107, 10, 
+        13, 101, 10, 13, 100, 13, 10, 48, 
+        13, 48, 57, 65, 70, 97, 102, 10, 
+        13, 10, 48, 13, 48, 57, 65, 70, 
+        97, 102, 10, 48, 13, 48, 49, 57, 
+        65, 70, 97, 102, 10, 13, 48, 49, 
+        57, 65, 70, 97, 102, 13, 48, 49, 
+        57, 65, 70, 97, 102, 13, 48, 49, 
+        57, 65, 70, 97, 102, 10, 13, 48, 
+        49, 57, 65, 70, 97, 102, 13, 48, 
+        10, 13, 48, 49, 57, 65, 70, 97, 
+        102, 13, 10, 9, 32, 34, 44, 47, 
+        58, 123, 125, 40, 41, 59, 64, 91, 
+        93, 13, 48, 49, 57, 65, 70, 97, 
+        102, 13, 48, 49, 57, 65, 70, 97, 
+        102, 0
+};
+
+static const char _hsh_http_single_lengths[] = {
+        0, 0, 1, 1, 1, 1, 1, 1, 
+        1, 1, 1, 1, 0, 1, 1, 11, 
+        8, 2, 3, 2, 1, 12, 9, 10, 
+        10, 10, 10, 10, 10, 9, 10, 10, 
+        10, 10, 10, 10, 8, 2, 3, 2, 
+        2, 10, 10, 10, 10, 10, 10, 10, 
+        9, 10, 10, 10, 10, 10, 10, 10, 
+        10, 8, 2, 4, 3, 3, 3, 3, 
+        3, 3, 1, 1, 1, 1, 1, 0, 
+        1, 1, 1, 1, 1, 0, 1, 2, 
+        3, 2, 2, 3, 2, 3, 1, 1, 
+        0, 0, 8, 0, 0, 2, 2, 0, 
+        0, 0
+};
+
+static const char _hsh_http_range_lengths[] = {
+        0, 2, 2, 0, 0, 0, 0, 0, 
+        0, 0, 0, 0, 1, 0, 0, 3, 
+        3, 0, 0, 0, 0, 3, 3, 3, 
+        3, 3, 3, 3, 3, 3, 3, 3, 
+        3, 3, 3, 3, 3, 0, 1, 0, 
+        1, 3, 3, 3, 3, 3, 3, 3, 
+        3, 3, 3, 3, 3, 3, 3, 3, 
+        3, 3, 0, 0, 0, 0, 0, 0, 
+        0, 0, 0, 0, 0, 3, 0, 0, 
+        0, 0, 0, 3, 0, 0, 0, 3, 
+        3, 3, 3, 3, 0, 3, 0, 0, 
+        0, 0, 3, 0, 0, 3, 3, 0, 
+        0, 0
+};
+
+static const short _hsh_http_index_offsets[] = {
+        0, 0, 3, 7, 9, 11, 13, 15, 
+        17, 19, 21, 23, 25, 27, 29, 31, 
+        46, 58, 61, 65, 68, 70, 86, 99, 
+        113, 127, 141, 155, 169, 183, 196, 210, 
+        224, 238, 252, 266, 280, 292, 295, 300, 
+        303, 307, 321, 335, 349, 363, 377, 391, 
+        405, 418, 432, 446, 460, 474, 488, 502, 
+        516, 530, 542, 545, 550, 554, 558, 562, 
+        566, 570, 574, 576, 578, 580, 585, 587, 
+        588, 590, 592, 594, 599, 601, 602, 604, 
+        610, 617, 623, 629, 636, 639, 646, 648, 
+        650, 651, 652, 664, 665, 666, 672, 678, 
+        679, 680
+};
+
+static const char _hsh_http_indicies[] = {
+        1, 1, 0, 2, 3, 3, 0, 0, 
+        4, 6, 5, 7, 0, 8, 0, 9, 
+        0, 10, 0, 11, 0, 12, 0, 13, 
+        0, 14, 0, 15, 0, 16, 0, 0, 
+        0, 0, 0, 0, 18, 19, 18, 19, 
+        0, 0, 0, 0, 0, 17, 0, 0, 
+        0, 0, 0, 21, 0, 0, 0, 0, 
+        0, 20, 22, 22, 0, 24, 25, 24, 
+        23, 0, 27, 26, 28, 0, 0, 30, 
+        0, 0, 0, 0, 31, 32, 31, 32, 
+        0, 0, 0, 0, 0, 29, 0, 33, 
+        0, 0, 0, 0, 21, 0, 0, 0, 
+        0, 0, 20, 0, 0, 0, 0, 0, 
+        21, 34, 34, 0, 0, 0, 0, 0, 
+        20, 0, 0, 0, 0, 0, 21, 35, 
+        35, 0, 0, 0, 0, 0, 20, 0, 
+        0, 0, 0, 0, 21, 36, 36, 0, 
+        0, 0, 0, 0, 20, 0, 0, 0, 
+        0, 0, 21, 37, 37, 0, 0, 0, 
+        0, 0, 20, 0, 0, 0, 0, 0, 
+        21, 38, 38, 0, 0, 0, 0, 0, 
+        20, 0, 0, 0, 0, 0, 21, 39, 
+        39, 0, 0, 0, 0, 0, 20, 0, 
+        0, 0, 0, 40, 0, 21, 0, 0, 
+        0, 0, 0, 20, 0, 0, 0, 0, 
+        0, 21, 41, 41, 0, 0, 0, 0, 
+        0, 20, 0, 0, 0, 0, 0, 21, 
+        42, 42, 0, 0, 0, 0, 0, 20, 
+        0, 0, 0, 0, 0, 21, 43, 43, 
+        0, 0, 0, 0, 0, 20, 0, 0, 
+        0, 0, 0, 21, 44, 44, 0, 0, 
+        0, 0, 0, 20, 0, 0, 0, 0, 
+        0, 21, 45, 45, 0, 0, 0, 0, 
+        0, 20, 0, 0, 0, 0, 0, 21, 
+        46, 46, 0, 0, 0, 0, 0, 20, 
+        0, 0, 0, 0, 0, 47, 0, 0, 
+        0, 0, 0, 20, 48, 48, 0, 49, 
+        25, 49, 50, 23, 28, 27, 26, 0, 
+        27, 51, 26, 0, 0, 0, 0, 0, 
+        21, 52, 52, 0, 0, 0, 0, 0, 
+        20, 0, 0, 0, 0, 0, 21, 53, 
+        53, 0, 0, 0, 0, 0, 20, 0, 
+        0, 0, 0, 0, 21, 54, 54, 0, 
+        0, 0, 0, 0, 20, 0, 0, 0, 
+        0, 0, 21, 55, 55, 0, 0, 0, 
+        0, 0, 20, 0, 0, 0, 0, 0, 
+        21, 56, 56, 0, 0, 0, 0, 0, 
+        20, 0, 0, 0, 0, 0, 21, 57, 
+        57, 0, 0, 0, 0, 0, 20, 0, 
+        0, 0, 0, 0, 21, 58, 58, 0, 
+        0, 0, 0, 0, 20, 0, 0, 0, 
+        0, 59, 0, 21, 0, 0, 0, 0, 
+        0, 20, 0, 0, 0, 0, 0, 21, 
+        60, 60, 0, 0, 0, 0, 0, 20, 
+        0, 0, 0, 0, 0, 21, 61, 61, 
+        0, 0, 0, 0, 0, 20, 0, 0, 
+        0, 0, 0, 21, 62, 62, 0, 0, 
+        0, 0, 0, 20, 0, 0, 0, 0, 
+        0, 21, 63, 63, 0, 0, 0, 0, 
+        0, 20, 0, 0, 0, 0, 0, 21, 
+        64, 64, 0, 0, 0, 0, 0, 20, 
+        0, 0, 0, 0, 0, 21, 65, 65, 
+        0, 0, 0, 0, 0, 20, 0, 0, 
+        0, 0, 0, 21, 66, 66, 0, 0, 
+        0, 0, 0, 20, 0, 0, 0, 0, 
+        0, 21, 67, 67, 0, 0, 0, 0, 
+        0, 20, 0, 0, 0, 0, 0, 68, 
+        0, 0, 0, 0, 0, 20, 69, 69, 
+        0, 70, 25, 70, 71, 23, 0, 27, 
+        72, 26, 0, 27, 73, 26, 0, 27, 
+        74, 26, 0, 27, 75, 26, 0, 27, 
+        76, 26, 0, 27, 77, 26, 78, 0, 
+        79, 0, 81, 80, 82, 83, 83, 83, 
+        0, 84, 0, 85, 86, 0, 87, 0, 
+        89, 88, 90, 91, 91, 91, 0, 92, 
+        0, 93, 95, 94, 96, 97, 98, 98, 
+        98, 94, 99, 96, 97, 98, 98, 98, 
+        94, 101, 102, 103, 103, 103, 100, 104, 
+        97, 98, 98, 98, 94, 105, 96, 97, 
+        98, 98, 98, 94, 106, 95, 94, 107, 
+        96, 97, 98, 98, 98, 94, 108, 0, 
+        109, 0, 110, 111, 0, 0, 0, 0, 
+        0, 21, 0, 0, 0, 0, 0, 20, 
+        112, 0, 101, 102, 103, 103, 103, 100, 
+        96, 97, 98, 98, 98, 94, 0, 113, 
+        114, 0
+};
+
+static const char _hsh_http_trans_targs[] = {
+        0, 2, 3, 2, 4, 4, 5, 6, 
+        7, 8, 9, 10, 11, 12, 13, 14, 
+        15, 16, 23, 41, 16, 17, 18, 19, 
+        18, 39, 19, 20, 21, 16, 22, 23, 
+        41, 90, 24, 25, 26, 27, 28, 29, 
+        30, 31, 32, 33, 34, 35, 36, 37, 
+        38, 38, 40, 40, 42, 43, 44, 45, 
+        46, 47, 48, 49, 50, 51, 52, 53, 
+        54, 55, 56, 57, 58, 59, 59, 60, 
+        61, 62, 63, 64, 65, 19, 67, 68, 
+        69, 72, 70, 69, 71, 91, 73, 92, 
+        75, 86, 76, 75, 77, 78, 79, 84, 
+        80, 82, 79, 81, 79, 80, 82, 79, 
+        83, 93, 85, 94, 87, 95, 96, 97, 
+        91, 96, 97
+};
+
+static const char _hsh_http_trans_actions[] = {
+        17, 19, 3, 5, 22, 5, 3, 1, 
+        0, 0, 0, 0, 0, 0, 0, 3, 
+        0, 64, 64, 64, 5, 3, 0, 25, 
+        25, 56, 5, 3, 5, 52, 52, 52, 
+        52, 43, 5, 5, 5, 5, 5, 5, 
+        5, 5, 5, 5, 5, 5, 5, 3, 
+        0, 25, 60, 37, 5, 5, 5, 5, 
+        5, 5, 5, 5, 5, 5, 5, 5, 
+        5, 5, 5, 5, 3, 0, 25, 25, 
+        5, 5, 5, 5, 5, 40, 0, 0, 
+        46, 0, 0, 7, 0, 28, 0, 11, 
+        46, 0, 0, 7, 0, 28, 76, 9, 
+        76, 49, 72, 76, 80, 80, 68, 85, 
+        76, 90, 76, 90, 0, 11, 31, 34, 
+        9, 13, 15
+};
+
+static const char _hsh_http_eof_actions[] = {
+        0, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        17, 17, 17, 17, 17, 17, 17, 17, 
+        0, 0, 0, 0, 0, 0, 0, 0, 
+        0, 0
+};
+
+static const int hsh_http_start = 1;
+static const int hsh_http_first_final = 90;
+static const int hsh_http_error = 0;
+
+static const int hsh_http_en_chunk_end = 66;
+static const int hsh_http_en_chunked_body = 74;
+static const int hsh_http_en_small_body = 88;
+static const int hsh_http_en_large_body = 89;
+static const int hsh_http_en_main = 1;
+
+
+#line 235 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+
+void hsh_parser_init(struct hsh_parser_s* parser) {
+  memset(parser, 0, sizeof(struct hsh_parser_s));
+  parser->state = hsh_http_start;
+}
+
+struct hsh_token_s hsh_parser_exec(struct hsh_parser_s* parser, struct hsh_buffer_s* buffer, int max_buf_capacity) {
+  struct hsh_token_s none = {};
+  none.type = HSH_TOK_NONE;
+  if (HTTP_FLAG_CHECK(parser->flags, HSH_P_FLAG_DONE) || parser->sequence_id == buffer->sequence_id) {
+    return none;
+  }
+  int cs = parser->state;
+  char* eof = NULL;
+  char *p = buffer->buf + buffer->index;
+  char *pe = buffer->buf + buffer->length;
+  
+#line 373 "/Users/jeremywilliams/code/httpserver.h/build/src/parser.c"
+        {
+        int _klen;
+        unsigned int _trans;
+        const char *_acts;
+        unsigned int _nacts;
+        const char *_keys;
+
+        if ( p == pe )
+                goto _test_eof;
+        if ( cs == 0 )
+                goto _out;
+_resume:
+        _keys = _hsh_http_trans_keys + _hsh_http_key_offsets[cs];
+        _trans = _hsh_http_index_offsets[cs];
+
+        _klen = _hsh_http_single_lengths[cs];
+        if ( _klen > 0 ) {
+                const char *_lower = _keys;
+                const char *_mid;
+                const char *_upper = _keys + _klen - 1;
+                while (1) {
+                        if ( _upper < _lower )
+                                break;
+
+                        _mid = _lower + ((_upper-_lower) >> 1);
+                        if ( (*p) < *_mid )
+                                _upper = _mid - 1;
+                        else if ( (*p) > *_mid )
+                                _lower = _mid + 1;
+                        else {
+                                _trans += (unsigned int)(_mid - _keys);
+                                goto _match;
+                        }
+                }
+                _keys += _klen;
+                _trans += _klen;
+        }
+
+        _klen = _hsh_http_range_lengths[cs];
+        if ( _klen > 0 ) {
+                const char *_lower = _keys;
+                const char *_mid;
+                const char *_upper = _keys + (_klen<<1) - 2;
+                while (1) {
+                        if ( _upper < _lower )
+                                break;
+
+                        _mid = _lower + (((_upper-_lower) >> 1) & ~1);
+                        if ( (*p) < _mid[0] )
+                                _upper = _mid - 2;
+                        else if ( (*p) > _mid[1] )
+                                _lower = _mid + 2;
+                        else {
+                                _trans += (unsigned int)((_mid - _keys)>>1);
+                                goto _match;
+                        }
+                }
+                _trans += _klen;
+        }
+
+_match:
+        _trans = _hsh_http_indicies[_trans];
+        cs = _hsh_http_trans_targs[_trans];
+
+        if ( _hsh_http_trans_actions[_trans] == 0 )
+                goto _again;
+
+        _acts = _hsh_http_actions + _hsh_http_trans_actions[_trans];
+        _nacts = (unsigned int) *_acts++;
+        while ( _nacts-- > 0 )
+        {
+                switch ( *_acts++ )
+                {
+        case 0:
+#line 23 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        { HSH_ENTER_TOKEN(HSH_TOK_METHOD, 32) }
+        break;
+        case 1:
+#line 24 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        { HSH_ENTER_TOKEN(HSH_TOK_TARGET, 1024) }
+        break;
+        case 2:
+#line 25 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        { HSH_ENTER_TOKEN(HSH_TOK_VERSION, 16) }
+        break;
+        case 3:
+#line 26 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        { HSH_ENTER_TOKEN(HSH_TOK_HEADER_KEY, 256) }
+        break;
+        case 4:
+#line 27 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        { HSH_ENTER_TOKEN(HSH_TOK_HEADER_VALUE, 4096) }
+        break;
+        case 5:
+#line 28 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->token.type = HSH_TOK_BODY;
+    parser->token.flags = 0;
+    parser->token.index = p - buffer->buf;
+  }
+        break;
+        case 6:
+#line 33 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->token.len = p - (buffer->buf + parser->token.index);
+    // hsh_token_array_push(&parser->tokens, parser->token);
+    HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_TOKEN_READY);
+    {p++; goto _out; }
+  }
+        break;
+        case 7:
+#line 40 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->content_length *= 10;
+    parser->content_length += (*p) - '0';
+  }
+        break;
+        case 8:
+#line 45 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_CHUNKED);
+  }
+        break;
+        case 9:
+#line 49 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->limit_count = 0;
+    parser->limit_max = 256;
+  }
+        break;
+        case 10:
+#line 54 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->limit_count++;
+    if (parser->limit_count > parser->limit_max) {
+      // parser->rc = (int8_t)HSH_PARSER_ERR;
+      {p++; goto _out; }
+    }
+  }
+        break;
+        case 11:
+#line 62 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    buffer->after_headers_index = p - buffer->buf + 1;
+    parser->content_remaining = parser->content_length;
+    parser->token = (struct hsh_token_s){ };
+    parser->token.type = HSH_TOK_HEADERS_DONE;
+    HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_TOKEN_READY);
+    if (HTTP_FLAG_CHECK(parser->flags, HSH_P_FLAG_CHUNKED)) {
+      HTTP_FLAG_SET(parser->token.flags, HSH_TOK_FLAG_STREAMED_BODY);
+      cs = 74;
+      {p++; goto _out; }
+    } else if (parser->content_length == 0) {
+      HTTP_FLAG_SET(parser->token.flags, HSH_TOK_FLAG_NO_BODY);
+      {p++; goto _out; }
+    // The body won't fit into the buffer at maximum capacity.
+    } else if (parser->content_length > max_buf_capacity - buffer->after_headers_index) {
+      HTTP_FLAG_SET(parser->token.flags, HSH_TOK_FLAG_STREAMED_BODY);
+      cs = 89;
+      {p++; goto _out; }
+    } else {
+      // Resize the buffer to hold the full body
+      if (parser->content_length + buffer->after_headers_index > buffer->capacity) {
+        buffer->buf = (char*)realloc(buffer->buf, parser->content_length + buffer->after_headers_index);
+        buffer->capacity = parser->content_length + buffer->after_headers_index;
+      }
+      cs = 88;
+      {p++; goto _out; }
+    }
+  }
+        break;
+        case 12:
+#line 91 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->content_length = 0;
+  }
+        break;
+        case 13:
+#line 95 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    if ((*p) >= 'A' && (*p) <= 'F') {
+      parser->content_length *= 0x10;
+      parser->content_length += (*p) - 55;
+    } else if ((*p) >= 'a' && (*p) <= 'f') {
+      parser->content_length *= 0x10;
+      parser->content_length += (*p) - 87;
+    } else if ((*p) >= '0' && (*p) <= '9') {
+      parser->content_length *= 0x10;
+      parser->content_length += (*p) - '0';
+    }
+  }
+        break;
+        case 14:
+#line 108 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    char* last_body_byte = buffer->buf + parser->token.index + parser->content_length - 1;
+    if (pe >= last_body_byte) {
+      p = last_body_byte;
+      parser->token.len = parser->content_length;
+      HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_TOKEN_READY);
+      cs = 66;
+      {p++; goto _out; }
+    // The current chunk is at the end of the buffer and the buffer cannot be expanded.
+    // Move the remaining contents of the buffer to just after the headers to free up
+    // capacity in the buffer.
+    } else if (p - buffer->buf + parser->content_length > max_buf_capacity) {
+      memcpy(buffer->buf + buffer->after_headers_index, p, pe - p);
+      buffer->length = buffer->after_headers_index + pe - p;
+      p = buffer->buf + buffer->after_headers_index;
+      parser->token.index = buffer->after_headers_index;
+      parser->sequence_id = buffer->sequence_id;
+      p--;
+      {p++; goto _out; }
+    }
+  }
+        break;
+        case 15:
+#line 130 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    // write 0 byte body to tokens
+    parser->token.type = HSH_TOK_BODY;
+    parser->token.index = 0;
+    parser->token.len = 0;
+    parser->token.flags = HSH_TOK_FLAG_BODY_FINAL;
+    HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_TOKEN_READY);
+    HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_DONE);
+    {p++; goto _out; }
+  }
+        break;
+        case 16:
+#line 141 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->token.index = buffer->after_headers_index;
+    parser->token.len = parser->content_length;
+    HTTP_FLAG_SET(parser->token.flags, HSH_TOK_FLAG_SMALL_BODY);
+    char* last_body_byte = buffer->buf + parser->token.index + parser->content_length - 1;
+    if (pe >= last_body_byte) {
+      HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_TOKEN_READY);
+      HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_DONE);
+    }
+    p = pe;
+    p--;
+    {p++; goto _out; }
+  }
+        break;
+        case 17:
+#line 155 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    parser->token.index = buffer->after_headers_index;
+    char* last_body_byte = buffer->buf + buffer->after_headers_index + parser->content_remaining - 1;
+    if (pe >= last_body_byte) {
+      parser->token.flags = HSH_TOK_FLAG_BODY_FINAL;
+      parser->token.len = parser->content_remaining;
+      parser->content_remaining = 0;
+      HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_TOKEN_READY);
+      HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_DONE);
+    } else {
+      parser->token.len = pe - p;
+      parser->content_remaining -= parser->token.len;
+      HTTP_FLAG_SET(parser->flags, HSH_P_FLAG_TOKEN_READY);
+      p = buffer->buf + buffer->after_headers_index;
+      buffer->length = buffer->after_headers_index;
+      parser->sequence_id = buffer->sequence_id;
+    }
+    p--;
+    {p++; goto _out; }
+  }
+        break;
+        case 18:
+#line 176 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    // parser->rc = (int8_t)HSH_PARSER_ERR;
+    {p++; goto _out; }
+  }
+        break;
+#line 649 "/Users/jeremywilliams/code/httpserver.h/build/src/parser.c"
+                }
+        }
+
+_again:
+        if ( cs == 0 )
+                goto _out;
+        if ( ++p != pe )
+                goto _resume;
+        _test_eof: {}
+        if ( p == eof )
+        {
+        const char *__acts = _hsh_http_actions + _hsh_http_eof_actions[cs];
+        unsigned int __nacts = (unsigned int) *__acts++;
+        while ( __nacts-- > 0 ) {
+                switch ( *__acts++ ) {
+        case 18:
+#line 176 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+        {
+    // parser->rc = (int8_t)HSH_PARSER_ERR;
+    {p++; goto _out; }
+  }
+        break;
+#line 672 "/Users/jeremywilliams/code/httpserver.h/build/src/parser.c"
+                }
+        }
+        }
+
+        _out: {}
+        }
+
+#line 252 "/Users/jeremywilliams/code/httpserver.h/src/parser.rl"
+  parser->state = cs;
+  buffer->index = p - buffer->buf;
+  if (HTTP_FLAG_CHECK(parser->flags, HSH_P_FLAG_TOKEN_READY)) {
+    HTTP_FLAG_CLEAR(parser->flags, HSH_P_FLAG_TOKEN_READY);
+    return parser->token;
+  } else {
+    parser->sequence_id = buffer->sequence_id;
+    return none;
+  }
+}
+
+#line 1 "read_socket.c"
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifndef HTTPSERVER_IMPL
+#include "common.h"
+#include "parser.h"
+#include "read_socket.h"
+#endif
+
+void _hs_token_array_push(struct hs_token_array_s *array,
+                          struct hsh_token_s a) {
+  if (array->size == array->capacity) {
+    array->capacity *= 2;
+    array->buf = (struct hsh_token_s *)realloc(
+        array->buf, array->capacity * sizeof(struct hsh_token_s));
+    assert(array->buf != NULL);
+  }
+  array->buf[array->size] = a;
+  array->size++;
+}
+
+void _hs_buffer_init(struct hsh_buffer_s *buffer, int initial_capacity,
+                     int64_t *memused) {
+  *buffer = (struct hsh_buffer_s){0};
+  buffer->buf = (char *)calloc(1, initial_capacity);
+  *memused += initial_capacity;
+  assert(buffer->buf != NULL);
+  buffer->capacity = initial_capacity;
+}
+
+int _hs_read_into_buffer(struct hsh_buffer_s *buffer, int request_socket,
+                         int64_t *server_memused,
+                         int64_t max_request_buf_capacity) {
+  int bytes;
+  do {
+    bytes = read(request_socket, buffer->buf + buffer->length,
+                 buffer->capacity - buffer->length);
+    if (bytes > 0)
+      buffer->length += bytes;
+
+    if (buffer->length == buffer->capacity &&
+        buffer->capacity != max_request_buf_capacity) {
+      *server_memused -= buffer->capacity;
+      buffer->capacity *= 2;
+      if (buffer->capacity > max_request_buf_capacity) {
+        buffer->capacity = max_request_buf_capacity;
+      }
+      *server_memused += buffer->capacity;
+      buffer->buf = (char *)realloc(buffer->buf, buffer->capacity);
+      assert(buffer->buf != NULL);
+    }
+  } while (bytes > 0 && buffer->capacity < max_request_buf_capacity);
+
+  buffer->sequence_id++;
+
+  return bytes;
+}
+
+int _hs_buffer_requires_read(struct hsh_buffer_s *buffer) {
+  return buffer->index >= buffer->length;
+}
+
+void _hs_exec_callback(http_request_t *request,
+                       void (*cb)(struct http_request_s *)) {
+  request->state = HTTP_SESSION_NOP;
+  cb(request);
+}
+
+enum hs_read_rc_e
+_hs_parse_buffer_and_exec_user_cb(http_request_t *request,
+                                  int max_request_buf_capacity) {
+  enum hs_read_rc_e rc = HS_READ_RC_SUCCESS;
+
+  do {
+    struct hsh_token_s token = hsh_parser_exec(
+        &request->parser, &request->buffer, max_request_buf_capacity);
+
+    switch (token.type) {
+    case HSH_TOK_HEADERS_DONE:
+      _hs_token_array_push(&request->tokens, token);
+      if (HTTP_FLAG_CHECK(token.flags, HSH_TOK_FLAG_STREAMED_BODY) ||
+          HTTP_FLAG_CHECK(token.flags, HSH_TOK_FLAG_NO_BODY)) {
+        HTTP_FLAG_SET(request->flags, HTTP_FLG_STREAMED);
+        _hs_exec_callback(request, request->server->request_handler);
+        return rc;
+      }
+      break;
+    case HSH_TOK_BODY:
+      _hs_token_array_push(&request->tokens, token);
+      if (HTTP_FLAG_CHECK(token.flags, HSH_TOK_FLAG_SMALL_BODY)) {
+        _hs_exec_callback(request, request->server->request_handler);
+      } else {
+        if (HTTP_FLAG_CHECK(token.flags, HSH_TOK_FLAG_BODY_FINAL) &&
+            token.len > 0) {
+          _hs_exec_callback(request, request->chunk_cb);
+
+          // A zero length body is used to indicate to the user code that the
+          // body has finished streaming. This is natural when dealing with
+          // chunked request bodies but requires us to inject a zero length
+          // body for non-chunked requests.
+          struct hsh_token_s token = {};
+          memset(&token, 0, sizeof(struct hsh_token_s));
+          token.type = HSH_TOK_BODY;
+          _hs_token_array_push(&request->tokens, token);
+          _hs_exec_callback(request, request->chunk_cb);
+        } else {
+          _hs_exec_callback(request, request->chunk_cb);
+        }
+      }
+      return rc;
+    case HSH_TOK_ERR:
+      return HS_READ_RC_PARSE_ERR;
+    case HSH_TOK_NONE:
+      return rc;
+    default:
+      _hs_token_array_push(&request->tokens, token);
+      break;
+    }
+  } while (1);
+}
+
+// Reads the request socket if required and parses HTTP in a non-blocking
+// manner.
+//
+// It should be called when a new connection is established and when a read
+// ready event occurs for the request socket. It parses the HTTP request and
+// fills the tokens array of the request struct. It will also invoke the
+// request_hander callback and the chunk_cb callback in the appropriate
+// scenarios.
+enum hs_read_rc_e hs_read_request_and_exec_user_cb(http_request_t *request,
+                                                   struct hs_read_opts_s opts) {
+  request->state = HTTP_SESSION_READ;
+  request->timeout = HTTP_REQUEST_TIMEOUT;
+
+  if (request->buffer.buf == NULL) {
+    _hs_buffer_init(&request->buffer, opts.initial_request_buf_capacity,
+                    &request->server->memused);
+    hsh_parser_init(&request->parser);
+  }
+
+  if (_hs_buffer_requires_read(&request->buffer)) {
+    int bytes = _hs_read_into_buffer(&request->buffer, request->socket,
+                                     &request->server->memused,
+                                     opts.max_request_buf_capacity);
+
+    if (bytes == opts.eof_rc) {
+      return HS_READ_RC_SOCKET_ERR;
+    }
+  }
+
+  return _hs_parse_buffer_and_exec_user_cb(request,
+                                           opts.max_request_buf_capacity);
+}
+
+#line 1 "respond.c"
+#include <assert.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef HTTPSERVER_IMPL
+#include "buffer_util.h"
+#include "common.h"
+#include "request_util.h"
+#include "respond.h"
+#endif
+
+char const *hs_status_text[] = {
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "",
+
+    // 100s
+    "Continue", "Switching Protocols", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "",
+
+    // 200s
+    "OK", "Created", "Accepted", "Non-Authoritative Information", "No Content",
+    "Reset Content", "Partial Content", "", "", "",
+
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+
+    // 300s
+    "Multiple Choices", "Moved Permanently", "Found", "See Other",
+    "Not Modified", "Use Proxy", "", "Temporary Redirect", "", "",
+
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+
+    // 400s
+    "Bad Request", "Unauthorized", "Payment Required", "Forbidden", "Not Found",
+    "Method Not Allowed", "Not Acceptable", "Proxy Authentication Required",
+    "Request Timeout", "Conflict",
+
+    "Gone", "Length Required", "", "Payload Too Large", "", "", "", "", "", "",
+
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "",
+
+    // 500s
+    "Internal Server Error", "Not Implemented", "Bad Gateway",
+    "Service Unavailable", "Gateway Timeout", "", "", "", "", "",
+
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
+    "", "", "", "", "", "", "", "", "", "", "", "", "", ""};
+typedef struct {
+  char *buf;
+  int capacity;
+  int size;
+  int64_t *memused;
+} grwprintf_t;
+
+void _grwprintf_init(grwprintf_t *ctx, int capacity, int64_t *memused) {
+  ctx->memused = memused;
+  ctx->size = 0;
+  ctx->buf = (char *)malloc(capacity);
+  *ctx->memused += capacity;
+  assert(ctx->buf != NULL);
+  ctx->capacity = capacity;
+}
+
+void _grwmemcpy(grwprintf_t *ctx, char const *src, int size) {
+  if (ctx->size + size > ctx->capacity) {
+    *ctx->memused -= ctx->capacity;
+    ctx->capacity = ctx->size + size;
+    *ctx->memused += ctx->capacity;
+    ctx->buf = (char *)realloc(ctx->buf, ctx->capacity);
+    assert(ctx->buf != NULL);
+  }
+  memcpy(ctx->buf + ctx->size, src, size);
+  ctx->size += size;
+}
+
+void _grwprintf(grwprintf_t *ctx, char const *fmt, ...) {
+  va_list args;
+  va_start(args, fmt);
+
+  int bytes =
+      vsnprintf(ctx->buf + ctx->size, ctx->capacity - ctx->size, fmt, args);
+  if (bytes + ctx->size > ctx->capacity) {
+    *ctx->memused -= ctx->capacity;
+    while (bytes + ctx->size > ctx->capacity)
+      ctx->capacity *= 2;
+    *ctx->memused += ctx->capacity;
+    ctx->buf = (char *)realloc(ctx->buf, ctx->capacity);
+    assert(ctx->buf != NULL);
+    bytes +=
+        vsnprintf(ctx->buf + ctx->size, ctx->capacity - ctx->size, fmt, args);
+  }
+  ctx->size += bytes;
+
+  va_end(args);
+}
+
+void _http_serialize_headers_list(http_response_t *response,
+                                  grwprintf_t *printctx) {
+  http_header_t *header = response->headers;
+  while (header) {
+    _grwprintf(printctx, "%s: %s\r\n", header->key, header->value);
+    header = header->next;
+  }
+  _grwprintf(printctx, "\r\n");
+}
+
+void _http_serialize_headers(http_request_t *request, http_response_t *response,
+                             grwprintf_t *printctx) {
+  if (HTTP_FLAG_CHECK(request->flags, HTTP_AUTOMATIC)) {
+    hs_request_detect_keep_alive_flag(request);
+  }
+  if (HTTP_FLAG_CHECK(request->flags, HTTP_KEEP_ALIVE)) {
+    hs_response_set_header(response, "Connection", "keep-alive");
+  } else {
+    hs_response_set_header(response, "Connection", "close");
+  }
+  _grwprintf(printctx, "HTTP/1.1 %d %s\r\nDate: %s\r\n", response->status,
+             hs_status_text[response->status], request->server->date);
+  if (!HTTP_FLAG_CHECK(request->flags, HTTP_CHUNKED_RESPONSE)) {
+    _grwprintf(printctx, "Content-Length: %d\r\n", response->content_length);
+  }
+  _http_serialize_headers_list(response, printctx);
+}
+
+void _http_perform_response(http_request_t *request, http_response_t *response,
+                            grwprintf_t *printctx, hs_req_fn_t http_write) {
+  http_header_t *header = response->headers;
+  while (header) {
+    http_header_t *tmp = header;
+    header = tmp->next;
+    free(tmp);
+  }
+  _hs_buffer_free(&request->buffer, &request->server->memused);
+  free(response);
+  request->buffer.buf = printctx->buf;
+  request->buffer.length = printctx->size;
+  request->buffer.capacity = printctx->capacity;
+  request->bytes_written = 0;
+  request->state = HTTP_SESSION_WRITE;
+  http_write(request);
+}
+
+// See api.h http_response_header
+void hs_response_set_header(http_response_t *response, char const *key,
+                            char const *value) {
+  http_header_t *header = (http_header_t *)malloc(sizeof(http_header_t));
+  assert(header != NULL);
+  header->key = key;
+  header->value = value;
+  http_header_t *prev = response->headers;
+  header->next = prev;
+  response->headers = header;
+}
+
+// Serializes the response into the request buffer and calls http_write.
+// See api.h http_respond for more details
+void hs_request_respond(http_request_t *request, http_response_t *response,
+                        hs_req_fn_t http_write) {
+  grwprintf_t printctx;
+  _grwprintf_init(&printctx, HTTP_RESPONSE_BUF_SIZE, &request->server->memused);
+  _http_serialize_headers(request, response, &printctx);
+  if (response->body) {
+    _grwmemcpy(&printctx, response->body, response->content_length);
+  }
+  _http_perform_response(request, response, &printctx, http_write);
+}
+
+// Serializes a chunk into the request buffer and calls http_write.
+// See api.h http_respond_chunk for more details.
+void hs_request_respond_chunk(http_request_t *request,
+                              http_response_t *response, hs_req_fn_t cb,
+                              hs_req_fn_t http_write) {
+  grwprintf_t printctx;
+  _grwprintf_init(&printctx, HTTP_RESPONSE_BUF_SIZE, &request->server->memused);
+  if (!HTTP_FLAG_CHECK(request->flags, HTTP_CHUNKED_RESPONSE)) {
+    HTTP_FLAG_SET(request->flags, HTTP_CHUNKED_RESPONSE);
+    hs_response_set_header(response, "Transfer-Encoding", "chunked");
+    _http_serialize_headers(request, response, &printctx);
+  }
+  request->chunk_cb = cb;
+  _grwprintf(&printctx, "%X\r\n", response->content_length);
+  _grwmemcpy(&printctx, response->body, response->content_length);
+  _grwprintf(&printctx, "\r\n");
+  _http_perform_response(request, response, &printctx, http_write);
+}
+
+// Serializes the zero sized final chunk into the request buffer and calls
+// http_write. See api.h http_respond_chunk_end for more details.
+void hs_request_respond_chunk_end(http_request_t *request,
+                                  http_response_t *response,
+                                  hs_req_fn_t http_write) {
+  grwprintf_t printctx;
+  _grwprintf_init(&printctx, HTTP_RESPONSE_BUF_SIZE, &request->server->memused);
+  _grwprintf(&printctx, "0\r\n");
+  _http_serialize_headers_list(response, &printctx);
+  _grwprintf(&printctx, "\r\n");
+  HTTP_FLAG_CLEAR(request->flags, HTTP_CHUNKED_RESPONSE);
+  _http_perform_response(request, response, &printctx, http_write);
+}
+
+// See api.h http_response_status
+void hs_response_set_status(http_response_t *response, int status) {
+  response->status = status > 599 || status < 100 ? 500 : status;
+}
+
+// See api.h http_response_body
+void hs_response_set_body(http_response_t *response, char const *body,
+                          int length) {
+  response->body = body;
+  response->content_length = length;
+}
+
+// See api.h http_response_init
+http_response_t *hs_response_init() {
+  http_response_t *response =
+      (http_response_t *)calloc(1, sizeof(http_response_t));
+  assert(response != NULL);
+  response->status = 200;
+  return response;
+}
+
+// Simple less flexible interface for responses, used for errors.
+void hs_request_respond_error(http_request_t *request, int code,
+                              char const *message, hs_req_fn_t http_write) {
+  struct http_response_s *response = hs_response_init();
+  hs_response_set_status(response, code);
+  hs_response_set_header(response, "Content-Type", "text/plain");
+  hs_response_set_body(response, message, strlen(message));
+  hs_request_respond(request, response, http_write);
+  http_write(request);
+}
+
+#line 1 "server.c"
+#include <arpa/inet.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <time.h>
+
+#ifdef EPOLL
+#include <sys/epoll.h>
+#include <sys/timerfd.h>
+#else
+#include <sys/event.h>
+#endif
+
+#ifndef HTTPSERVER_IMPL
+#include "common.h"
+#include "server.h"
+#endif
+
+void _hs_bind_localhost(int s, struct sockaddr_in *addr, const char *ipaddr,
+                        int port) {
+  addr->sin_family = AF_INET;
+  if (ipaddr == NULL) {
+    addr->sin_addr.s_addr = INADDR_ANY;
+  } else {
+    addr->sin_addr.s_addr = inet_addr(ipaddr);
+  }
+  addr->sin_port = htons(port);
+  int rc = bind(s, (struct sockaddr *)addr, sizeof(struct sockaddr_in));
+  if (rc < 0) {
+    exit(1);
+  }
+}
+
+#ifdef KQUEUE
+
+void _hs_add_server_sock_events(http_server_t *serv) {
+  struct kevent ev_set;
+  EV_SET(&ev_set, serv->socket, EVFILT_READ, EV_ADD | EV_CLEAR, 0, 0, serv);
+  kevent(serv->loop, &ev_set, 1, NULL, 0, NULL);
+}
+
+void _hs_server_init_events(http_server_t *serv, hs_evt_cb_t unused) {
+  (void)unused;
+
+  serv->loop = kqueue();
+  struct kevent ev_set;
+  EV_SET(&ev_set, 1, EVFILT_TIMER, EV_ADD | EV_ENABLE, NOTE_SECONDS, 1, serv);
+  kevent(serv->loop, &ev_set, 1, NULL, 0, NULL);
+}
+
+int hs_server_run_event_loop(http_server_t *serv, const char *ipaddr) {
+  hs_server_listen_on_addr(serv, ipaddr);
+
+  struct kevent ev_list[1];
+
+  while (1) {
+    int nev = kevent(serv->loop, NULL, 0, ev_list, 1, NULL);
+    for (int i = 0; i < nev; i++) {
+      ev_cb_t *ev_cb = (ev_cb_t *)ev_list[i].udata;
+      ev_cb->handler(&ev_list[i]);
+    }
+  }
+  return 0;
+}
+
+int hs_server_poll_events(http_server_t *serv) {
+  struct kevent ev;
+  struct timespec ts = {0, 0};
+  int nev = kevent(serv->loop, NULL, 0, &ev, 1, &ts);
+  if (nev <= 0)
+    return nev;
+  ev_cb_t *ev_cb = (ev_cb_t *)ev.udata;
+  ev_cb->handler(&ev);
+  return nev;
+}
+
+#else
+
+void _hs_server_init_events(http_server_t *serv, hs_evt_cb_t timer_cb) {
+  serv->loop = epoll_create1(0);
+  serv->timer_handler = timer_cb;
+
+  int tfd = timerfd_create(CLOCK_MONOTONIC, 0);
+  struct itimerspec ts = {};
+  ts.it_value.tv_sec = 1;
+  ts.it_interval.tv_sec = 1;
+  timerfd_settime(tfd, 0, &ts, NULL);
+
+  struct epoll_event ev;
+  ev.events = EPOLLIN | EPOLLET;
+  ev.data.ptr = &serv->timer_handler;
+  epoll_ctl(serv->loop, EPOLL_CTL_ADD, tfd, &ev);
+  serv->timerfd = tfd;
+}
+
+void _hs_add_server_sock_events(http_server_t *serv) {
+  struct epoll_event ev;
+  ev.events = EPOLLIN | EPOLLET;
+  ev.data.ptr = serv;
+  epoll_ctl(serv->loop, EPOLL_CTL_ADD, serv->socket, &ev);
+}
+
+int hs_server_run_event_loop(http_server_t *serv, const char *ipaddr) {
+  hs_server_listen_on_addr(serv, ipaddr);
+  struct epoll_event ev_list[1];
+  while (1) {
+    int nev = epoll_wait(serv->loop, ev_list, 1, -1);
+    for (int i = 0; i < nev; i++) {
+      ev_cb_t *ev_cb = (ev_cb_t *)ev_list[i].data.ptr;
+      ev_cb->handler(&ev_list[i]);
+    }
+  }
+  return 0;
+}
+
+int hs_server_poll_events(http_server_t *serv) {
+  struct epoll_event ev;
+  int nev = epoll_wait(serv->loop, &ev, 1, 0);
+  if (nev <= 0)
+    return nev;
+  ev_cb_t *ev_cb = (ev_cb_t *)ev.data.ptr;
+  ev_cb->handler(&ev);
+  return nev;
+}
+
+#endif
+
+void hs_server_listen_on_addr(http_server_t *serv, const char *ipaddr) {
+  // Ignore SIGPIPE. We handle these errors at the call site.
+  signal(SIGPIPE, SIG_IGN);
+  serv->socket = socket(AF_INET, SOCK_STREAM, 0);
+  int flag = 1;
+  setsockopt(serv->socket, SOL_SOCKET, SO_REUSEPORT, &flag, sizeof(flag));
+  _hs_bind_localhost(serv->socket, &serv->addr, ipaddr, serv->port);
+  serv->len = sizeof(serv->addr);
+  int flags = fcntl(serv->socket, F_GETFL, 0);
+  fcntl(serv->socket, F_SETFL, flags | O_NONBLOCK);
+  listen(serv->socket, 128);
+  _hs_add_server_sock_events(serv);
+}
+
+void hs_generate_date_time(char *datetime) {
+  time_t rawtime;
+  struct tm *timeinfo;
+  time(&rawtime);
+  timeinfo = gmtime(&rawtime);
+  strftime(datetime, 32, "%a, %d %b %Y %T GMT", timeinfo);
+}
+
+http_server_t *hs_server_init(int port, void (*handler)(http_request_t *),
+                              hs_evt_cb_t accept_cb,
+                              hs_evt_cb_t epoll_timer_cb) {
+  http_server_t *serv = (http_server_t *)malloc(sizeof(http_server_t));
+  assert(serv != NULL);
+  serv->port = port;
+  serv->memused = 0;
+  serv->handler = accept_cb;
+  _hs_server_init_events(serv, epoll_timer_cb);
+  hs_generate_date_time(serv->date);
+  serv->request_handler = handler;
+  return serv;
+}
+
+#line 1 "write_socket.c"
+#include <errno.h>
+#include <unistd.h>
+
+#ifndef HTTPSERVER_IMPL
+#include "common.h"
+#include "write_socket.h"
+#endif
+
+#ifdef DEBUG
+#define write hs_test_write
+ssize_t hs_test_write(int fd, char const *data, size_t size);
+#endif
+
+// Writes response bytes from the buffer out to the socket.
+//
+// Runs when we get a socket ready to write event or when initiating an HTTP
+// response and writing to the socket for the first time. If the response is
+// chunked the chunk_cb callback will be invoked signalling to the user code
+// that another chunk is ready to be written.
+enum hs_write_rc_e hs_write_socket(http_request_t *request) {
+  int bytes =
+      write(request->socket, request->buffer.buf + request->bytes_written,
+            request->buffer.length - request->bytes_written);
+  if (bytes > 0)
+    request->bytes_written += bytes;
+
+  enum hs_write_rc_e rc = HS_WRITE_RC_SUCCESS;
+
+  if (errno == EPIPE) {
+    rc = HS_WRITE_RC_SOCKET_ERR;
+  } else {
+    if (request->bytes_written != request->buffer.length) {
+      // All bytes of the body were not written and we need to wait until the
+      // socket is writable again to complete the write
+      rc = HS_WRITE_RC_CONTINUE;
+    } else if (HTTP_FLAG_CHECK(request->flags, HTTP_CHUNKED_RESPONSE)) {
+      // All bytes of the chunk were written and we need to get the next chunk
+      // from the application.
+      rc = HS_WRITE_RC_SUCCESS_CHUNK;
+    } else {
+      if (HTTP_FLAG_CHECK(request->flags, HTTP_KEEP_ALIVE)) {
+        rc = HS_WRITE_RC_SUCCESS;
+      } else {
+        rc = HS_WRITE_RC_SUCCESS_CLOSE;
+      }
+    }
+  }
+
+  return rc;
+}
+
+#line 1 "connection.c"
+#include <assert.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#ifdef KQUEUE
+#include <sys/event.h>
+#else
+#include <sys/epoll.h>
+#include <sys/timerfd.h>
+#include <time.h>
+#endif
+
+#ifndef HTTPSERVER_IMPL
+#include "buffer_util.h"
+#include "common.h"
+#include "connection.h"
+#endif
+
+#ifdef KQUEUE
+
+void _hs_delete_events(http_request_t *request) {
+  struct kevent ev_set;
+  EV_SET(&ev_set, request->socket, EVFILT_TIMER, EV_DELETE, 0, 0, request);
+  kevent(request->server->loop, &ev_set, 1, NULL, 0, NULL);
+}
+
+void _hs_add_timer_event(http_request_t *request, hs_io_cb_t unused) {
+  (void)unused;
+
+  struct kevent ev_set;
+  EV_SET(&ev_set, request->socket, EVFILT_TIMER, EV_ADD | EV_ENABLE, 0, 1000,
+         request);
+  kevent(request->server->loop, &ev_set, 1, NULL, 0, NULL);
+}
+
+#else
+
+void _hs_delete_events(http_request_t *request) {
+  epoll_ctl(request->server->loop, EPOLL_CTL_DEL, request->socket, NULL);
+  epoll_ctl(request->server->loop, EPOLL_CTL_DEL, request->timerfd, NULL);
+  close(request->timerfd);
+}
+
+void _hs_add_timer_event(http_request_t *request, hs_io_cb_t timer_cb) {
+  request->timer_handler = timer_cb;
+
+  // Watch for read events
+  struct epoll_event ev;
+  ev.events = EPOLLIN | EPOLLET;
+  ev.data.ptr = request;
+  epoll_ctl(request->server->loop, EPOLL_CTL_ADD, request->socket, &ev);
+
+  // Add timer to timeout requests.
+  int tfd = timerfd_create(CLOCK_MONOTONIC, 0);
+  struct itimerspec ts = {};
+  ts.it_value.tv_sec = 1;
+  ts.it_interval.tv_sec = 1;
+  timerfd_settime(tfd, 0, &ts, NULL);
+
+  ev.events = EPOLLIN | EPOLLET;
+  ev.data.ptr = &request->timer_handler;
+  epoll_ctl(request->server->loop, EPOLL_CTL_ADD, tfd, &ev);
+  request->timerfd = tfd;
+}
+
+#endif
+
+void hs_request_terminate_connection(http_request_t *request) {
+  _hs_delete_events(request);
+  close(request->socket);
+  _hs_buffer_free(&request->buffer, &request->server->memused);
+  free(request->tokens.buf);
+  request->tokens.buf = NULL;
+  free(request);
+}
+
+void _hs_token_array_init(struct hs_token_array_s *array, int capacity) {
+  array->buf =
+      (struct hsh_token_s *)malloc(sizeof(struct hsh_token_s) * capacity);
+  assert(array->buf != NULL);
+  array->size = 0;
+  array->capacity = capacity;
+}
+
+http_request_t *_hs_request_init(int sock, http_server_t *server,
+                                 hs_io_cb_t io_cb) {
+  http_request_t *request = (http_request_t *)calloc(1, sizeof(http_request_t));
+  assert(request != NULL);
+  request->socket = sock;
+  request->server = server;
+  request->handler = io_cb;
+  request->timeout = HTTP_REQUEST_TIMEOUT;
+  request->flags = HTTP_AUTOMATIC;
+  request->parser = (struct hsh_parser_s){};
+  request->buffer = (struct hsh_buffer_s){};
+  request->tokens.buf = NULL;
+  _hs_token_array_init(&request->tokens, 32);
+  return request;
+}
+
+http_request_t *hs_server_accept_connection(http_server_t *server,
+                                            hs_io_cb_t io_cb,
+                                            hs_io_cb_t epoll_timer_cb) {
+  http_request_t *request = NULL;
+  int sock = 0;
+
+  sock = accept(server->socket, (struct sockaddr *)&server->addr, &server->len);
+
+  if (sock > 0) {
+    int flags = fcntl(sock, F_GETFL, 0);
+    fcntl(sock, F_SETFL, flags | O_NONBLOCK);
+
+    request = _hs_request_init(sock, server, io_cb);
+    _hs_add_timer_event(request, epoll_timer_cb);
+  }
+  return request;
+}
+
+#line 1 "io_events.c"
+#include <stdlib.h>
+
+#ifdef KQUEUE
+#include <sys/event.h>
+#else
+#include <stdint.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+#endif
+
+#ifndef HTTPSERVER_IMPL
+#include "buffer_util.h"
+#include "common.h"
+#include "connection.h"
+#include "io_events.h"
+#include "read_socket.h"
+#include "respond.h"
+#include "server.h"
+#include "write_socket.h"
+#endif
+
+void _hs_read_socket_and_handle_return_code(http_request_t *request) {
+  struct hs_read_opts_s opts;
+  opts.initial_request_buf_capacity = HTTP_REQUEST_BUF_SIZE;
+  opts.max_request_buf_capacity = HTTP_MAX_REQUEST_BUF_SIZE;
+  opts.eof_rc = 0;
+
+  enum hs_read_rc_e rc = hs_read_request_and_exec_user_cb(request, opts);
+  switch (rc) {
+  case HS_READ_RC_PARSE_ERR:
+    hs_request_respond_error(request, 400, "Bad Request",
+                             hs_request_begin_write);
+    break;
+  case HS_READ_RC_SOCKET_ERR:
+    hs_request_terminate_connection(request);
+    break;
+  case HS_READ_RC_SUCCESS:
+    break;
+  }
+}
+
+void hs_request_begin_read(http_request_t *request);
+
+void _hs_write_socket_and_handle_return_code(http_request_t *request) {
+  enum hs_write_rc_e rc = hs_write_socket(request);
+
+  request->timeout = rc == HS_WRITE_RC_SUCCESS ? HTTP_KEEP_ALIVE_TIMEOUT
+                                               : HTTP_REQUEST_TIMEOUT;
+
+  if (rc != HS_WRITE_RC_CONTINUE)
+    _hs_buffer_free(&request->buffer, &request->server->memused);
+
+  switch (rc) {
+  case HS_WRITE_RC_SUCCESS_CLOSE:
+  case HS_WRITE_RC_SOCKET_ERR:
+    // Error or response complete, connection: close
+    hs_request_terminate_connection(request);
+    break;
+  case HS_WRITE_RC_SUCCESS:
+    // Response complete, keep-alive connection
+    hs_request_begin_read(request);
+    break;
+  case HS_WRITE_RC_SUCCESS_CHUNK:
+    // Finished writing chunk, request next
+    request->state = HTTP_SESSION_NOP;
+    request->chunk_cb(request);
+    break;
+  case HS_WRITE_RC_CONTINUE:
+    break;
+  }
+}
+
+void _hs_accept_and_begin_request_cycle(http_server_t *server,
+                                        hs_io_cb_t on_client_connection_cb,
+                                        hs_io_cb_t on_timer_event_cb) {
+  http_request_t *request = NULL;
+  while ((request = hs_server_accept_connection(server, on_client_connection_cb,
+                                                on_timer_event_cb))) {
+    if (server->memused > HTTP_MAX_TOTAL_EST_MEM_USAGE) {
+      hs_request_respond_error(request, 503, "Service Unavailable",
+                               hs_request_begin_write);
+    } else {
+      hs_request_begin_read(request);
+    }
+  }
+}
+
+#ifdef KQUEUE
+
+void _hs_on_kqueue_client_connection_event(struct kevent *ev) {
+  http_request_t *request = (http_request_t *)ev->udata;
+  if (ev->filter == EVFILT_TIMER) {
+    request->timeout -= 1;
+    if (request->timeout == 0)
+      hs_request_terminate_connection(request);
+  } else {
+    if (request->state == HTTP_SESSION_READ) {
+      _hs_read_socket_and_handle_return_code(request);
+    } else if (request->state == HTTP_SESSION_WRITE) {
+      _hs_write_socket_and_handle_return_code(request);
+    }
+  }
+}
+
+void hs_on_kqueue_server_event(struct kevent *ev) {
+  http_server_t *server = (http_server_t *)ev->udata;
+  if (ev->filter == EVFILT_TIMER) {
+    hs_generate_date_time(server->date);
+  } else {
+    _hs_accept_and_begin_request_cycle(
+        server, _hs_on_kqueue_client_connection_event, NULL);
+  }
+}
+
+#else
+
+void _hs_on_epoll_client_connection_event(struct epoll_event *ev) {
+  http_request_t *request = (http_request_t *)ev->data.ptr;
+  if (request->state == HTTP_SESSION_READ) {
+    _hs_read_socket_and_handle_return_code(request);
+  } else if (request->state == HTTP_SESSION_WRITE) {
+    _hs_write_socket_and_handle_return_code(request);
+  }
+}
+
+void _hs_on_epoll_request_timer_event(struct epoll_event *ev) {
+  http_request_t *request =
+      (http_request_t *)((char *)ev->data.ptr - sizeof(epoll_cb_t));
+  uint64_t res;
+  int bytes = read(request->timerfd, &res, sizeof(res));
+  (void)bytes; // suppress warning
+  request->timeout -= 1;
+  if (request->timeout == 0)
+    hs_request_terminate_connection(request);
+}
+
+void hs_on_epoll_server_connection_event(struct epoll_event *ev) {
+  _hs_accept_and_begin_request_cycle((http_server_t *)ev->data.ptr,
+                                     _hs_on_epoll_client_connection_event,
+                                     _hs_on_epoll_request_timer_event);
+}
+
+void hs_on_epoll_server_timer_event(struct epoll_event *ev) {
+  http_server_t *server =
+      (http_server_t *)((char *)ev->data.ptr - sizeof(epoll_cb_t));
+  uint64_t res;
+  int bytes = read(server->timerfd, &res, sizeof(res));
+  (void)bytes; // suppress warning
+  hs_generate_date_time(server->date);
+}
+
+#endif
+
+void _hs_add_write_event(http_request_t *request) {
+#ifdef KQUEUE
+  struct kevent ev_set[2];
+  EV_SET(&ev_set[0], request->socket, EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0,
+         request);
+  EV_SET(&ev_set[1], request->socket, EVFILT_READ, EV_DISABLE, 0, 0, request);
+  kevent(request->server->loop, ev_set, 2, NULL, 0, NULL);
+#else
+  struct epoll_event ev;
+  ev.events = EPOLLOUT | EPOLLET;
+  ev.data.ptr = request;
+  epoll_ctl(request->server->loop, EPOLL_CTL_MOD, request->socket, &ev);
+#endif
+}
+
+void hs_request_begin_write(http_request_t *request) {
+  request->state = HTTP_SESSION_WRITE;
+  _hs_add_write_event(request);
+  _hs_write_socket_and_handle_return_code(request);
+}
+
+void _hs_add_read_event(http_request_t *request) {
+#ifdef KQUEUE
+  // No action needed for kqueue since it's read event stays active. Should
+  // it be disabled during write?
+  struct kevent ev_set;
+  EV_SET(&ev_set, request->socket, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0,
+         request);
+  kevent(request->server->loop, &ev_set, 1, NULL, 0, NULL);
+#else
+  struct epoll_event ev;
+  ev.events = EPOLLIN | EPOLLET;
+  ev.data.ptr = request;
+  epoll_ctl(request->server->loop, EPOLL_CTL_MOD, request->socket, &ev);
+#endif
+}
+
+void hs_request_begin_read(http_request_t *request) {
+  request->state = HTTP_SESSION_READ;
+  _hs_add_read_event(request);
+  _hs_read_socket_and_handle_return_code(request);
+}
+
+#endif
+#endif
+#endif