HTTP and HTTPS library for Mbed OS 5

Dependents:   MQTTGateway2 MQTTGatewayK64 http-example-wnc GuardRoom ... more

For the example program, see: sandbox/http-example.

This library is used to make HTTP and HTTPS calls from Mbed OS 5 applications.

HTTP Request API

NetworkInterface* network = /* obtain a NetworkInterface object */

const char body[] = "{\"hello\":\"world\"}";

HttpRequest* request = new HttpRequest(network, HTTP_POST, "http://httpbin.org/post");
request->set_header("Content-Type", "application/json");
HttpResponse* response = request->send(body, strlen(body));
// if response is NULL, check response->get_error()

printf("status is %d - %s\n", response->get_status_code(), response->get_status_message());
printf("body is:\n%s\n", response->get_body_as_string().c_str());

delete request; // also clears out the response

HTTPS Request API

// pass in the root certificates that you trust, there is no central CA registry in Mbed OS
const char SSL_CA_PEM[] = "-----BEGIN CERTIFICATE-----\n"
    /* rest of the CA root certificates */;

NetworkInterface* network = /* obtain a NetworkInterface object */

const char body[] = "{\"hello\":\"world\"}";

HttpsRequest* request = new HttpsRequest(network, SSL_CA_PEM, HTTP_GET "https://httpbin.org/status/418");
HttpResponse* response = request->send();
// if response is NULL, check response->get_error()

printf("status is %d - %s\n", response->get_status_code(), response->get_status_message());
printf("body is:\n%s\n", response->get_body().c_str());

delete request;

Note: You can get the root CA for a domain easily from Firefox. Click on the green padlock, click More information > Security > View certificate > Details. Select the top entry in the 'Certificate Hierarchy' and click Export.... This gives you a PEM file. Add the content of the PEM file to your root CA list (here's an image).

Mbed TLS Entropy configuration

If your target does not have a built-in TRNG, or other entropy sources, add the following macros to your mbed_app.json file to disable entropy:

{
    "macros": [
        "MBEDTLS_TEST_NULL_ENTROPY",
        "MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES"
    ]
}

Note that this is not secure, and you should not deploy this device into production with this configuration.

Memory usage

Small requests where the body of the response is cached by the library (like the one found in main-http.cpp), require 4K of RAM. When the request is finished they require 1.5K of RAM, depending on the size of the response. This applies both to HTTP and HTTPS. If you need to handle requests that return a large response body, see 'Dealing with large body'.

HTTPS requires additional memory: on FRDM-K64F about 50K of heap space (at its peak). This means that you cannot use HTTPS on devices with less than 128K of memory, asyou also need to reserve memory for the stack and network interface.

Dealing with large response body

By default the library will store the full request body on the heap. This works well for small responses, but you'll run out of memory when receiving a large response body. To mitigate this you can pass in a callback as the last argument to the request constructor. This callback will be called whenever a chunk of the body is received. You can set the request chunk size in the HTTP_RECEIVE_BUFFER_SIZE macro (see mbed_lib.json for the definition) although it also depends on the buffer size ofthe underlying network connection.

void body_callback(const char* data, uint32_t data_len) {
    // do something with the data
}

HttpRequest* req = new HttpRequest(network, HTTP_GET, "http://pathtolargefile.com", &body_callback);
req->send(NULL, 0);

Dealing with a large request body

If you cannot load the full request into memory, you can pass a callback into the send function. Through this callback you can feed in chunks of the request body. This is very useful if you want to send files from a file system.

const void * get_chunk(uint32_t* out_size) {
    // set the value of out_size (via *out_size = 10) to the size of the buffer
    // return the buffer

    // if you don't have any more data, set *out_size to 0
}

HttpRequest* req = new HttpRequest(network, HTTP_POST, "http://my_api.com/upload");
req->send(callback(&get_chunk));

Socket re-use

By default the library opens a new socket per request. This is wasteful, especially when dealing with TLS requests. You can re-use sockets like this:

HTTP

TCPSocket* socket = new TCPSocket();

nsapi_error_t open_result = socket->open(network);
// check open_result

nsapi_error_t connect_result = socket->connect("httpbin.org", 80);
// check connect_result

// Pass in `socket`, instead of `network` as first argument
HttpRequest* req = new HttpRequest(socket, HTTP_GET, "http://httpbin.org/status/418");

HTTPS

TLSSocket* socket = new TLSSocket();

nsapi_error_t r;
// make sure to check the return values for the calls below (should return NSAPI_ERROR_OK)
r = socket->open(network);
r = socket->set_root_ca_cert(SSL_CA_PEM);
r = socket->connect("httpbin.org", 443);

// Pass in `socket`, instead of `network` as first argument, and omit the `SSL_CA_PEM` argument
HttpsRequest* get_req = new HttpsRequest(socket, HTTP_GET, "https://httpbin.org/status/418");

Request logging

To make debugging easier you can log the raw request body that goes over the line. This also works with chunked encoding.

uint8_t *request_buffer = (uint8_t*)calloc(2048, 1);
req->set_request_log_buffer(request_buffer, 2048);

// after the request is done:
printf("\n----- Request buffer -----\n");
for (size_t ix = 0; ix < req->get_request_log_buffer_length(); ix++) {
    printf("%02x ", request_buffer[ix]);
}
printf("\n");

Integration tests

Integration tests are located in the TESTS folder and are ran through Greentea. Instructions on how to run the tests are in http-example.

Mbed OS 5.10 or lower

If you want to use this library on Mbed OS 5.10 or lower, you need to add the TLSSocket library to your project. This library is included in Mbed OS 5.11 and up.

Tested on

  • K64F with Ethernet.
  • NUCLEO_F411RE with ESP8266.
  • ODIN-W2 with WiFi.
  • K64F with Atmel 6LoWPAN shield.
  • DISCO-L475VG-IOT01A with WiFi.
  • Mbed Simulator.

http_parser/http_parser.h

Committer:
Jan Jongboom
Date:
23 months ago
Revision:
39:a8d157986ad8
Parent:
32:fa4d71265625

File content as of revision 39:a8d157986ad8:

/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * 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.
 */
#ifndef http_parser_h
#define http_parser_h

#ifdef __cplusplus
extern "C" {
#endif

/* Also update SONAME in the Makefile whenever you change these. */
#define HTTP_PARSER_VERSION_MAJOR 2
#define HTTP_PARSER_VERSION_MINOR 7
#define HTTP_PARSER_VERSION_PATCH 1

#if defined(_WIN32) && !defined(__MINGW32__) && \
  (!defined(_MSC_VER) || _MSC_VER<1600) && !defined(__WINE__)
#include <BaseTsd.h>
#include <stddef.h>
typedef __int8 int8_t;
typedef unsigned __int8 uint8_t;
typedef __int16 int16_t;
typedef unsigned __int16 uint16_t;
typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#else
#include <stdint.h>
#endif

/* Compile with -DHTTP_PARSER_STRICT=0 to make less checks, but run
 * faster
 */
#ifndef HTTP_PARSER_STRICT
# define HTTP_PARSER_STRICT 1
#endif

/* Maximium header size allowed. If the macro is not defined
 * before including this header then the default is used. To
 * change the maximum header size, define the macro in the build
 * environment (e.g. -DHTTP_MAX_HEADER_SIZE=<value>). To remove
 * the effective limit on the size of the header, define the macro
 * to a very large number (e.g. -DHTTP_MAX_HEADER_SIZE=0x7fffffff)
 */
#ifndef HTTP_MAX_HEADER_SIZE
# define HTTP_MAX_HEADER_SIZE (80*1024)
#endif

typedef struct http_parser http_parser;
typedef struct http_parser_settings http_parser_settings;


/* Callbacks should return non-zero to indicate an error. The parser will
 * then halt execution.
 *
 * The one exception is on_headers_complete. In a HTTP_RESPONSE parser
 * returning '1' from on_headers_complete will tell the parser that it
 * should not expect a body. This is used when receiving a response to a
 * HEAD request which may contain 'Content-Length' or 'Transfer-Encoding:
 * chunked' headers that indicate the presence of a body.
 *
 * Returning `2` from on_headers_complete will tell parser that it should not
 * expect neither a body nor any futher responses on this connection. This is
 * useful for handling responses to a CONNECT request which may not contain
 * `Upgrade` or `Connection: upgrade` headers.
 *
 * http_data_cb does not return data chunks. It will be called arbitrarily
 * many times for each string. E.G. you might get 10 callbacks for "on_url"
 * each providing just a few characters more data.
 */
typedef int (*http_data_cb) (http_parser*, const char *at, uint32_t length);
typedef int (*http_cb) (http_parser*);


/* Status Codes */
#define HTTP_STATUS_MAP(XX)                                                 \
  XX(100, CONTINUE,                        Continue)                        \
  XX(101, SWITCHING_PROTOCOLS,             Switching Protocols)             \
  XX(102, PROCESSING,                      Processing)                      \
  XX(200, OK,                              OK)                              \
  XX(201, CREATED,                         Created)                         \
  XX(202, ACCEPTED,                        Accepted)                        \
  XX(203, NON_AUTHORITATIVE_INFORMATION,   Non-Authoritative Information)   \
  XX(204, NO_CONTENT,                      No Content)                      \
  XX(205, RESET_CONTENT,                   Reset Content)                   \
  XX(206, PARTIAL_CONTENT,                 Partial Content)                 \
  XX(207, MULTI_STATUS,                    Multi-Status)                    \
  XX(208, ALREADY_REPORTED,                Already Reported)                \
  XX(226, IM_USED,                         IM Used)                         \
  XX(300, MULTIPLE_CHOICES,                Multiple Choices)                \
  XX(301, MOVED_PERMANENTLY,               Moved Permanently)               \
  XX(302, FOUND,                           Found)                           \
  XX(303, SEE_OTHER,                       See Other)                       \
  XX(304, NOT_MODIFIED,                    Not Modified)                    \
  XX(305, USE_PROXY,                       Use Proxy)                       \
  XX(307, TEMPORARY_REDIRECT,              Temporary Redirect)              \
  XX(308, PERMANENT_REDIRECT,              Permanent Redirect)              \
  XX(400, BAD_REQUEST,                     Bad Request)                     \
  XX(401, UNAUTHORIZED,                    Unauthorized)                    \
  XX(402, PAYMENT_REQUIRED,                Payment Required)                \
  XX(403, FORBIDDEN,                       Forbidden)                       \
  XX(404, NOT_FOUND,                       Not Found)                       \
  XX(405, METHOD_NOT_ALLOWED,              Method Not Allowed)              \
  XX(406, NOT_ACCEPTABLE,                  Not Acceptable)                  \
  XX(407, PROXY_AUTHENTICATION_REQUIRED,   Proxy Authentication Required)   \
  XX(408, REQUEST_TIMEOUT,                 Request Timeout)                 \
  XX(409, CONFLICT,                        Conflict)                        \
  XX(410, GONE,                            Gone)                            \
  XX(411, LENGTH_REQUIRED,                 Length Required)                 \
  XX(412, PRECONDITION_FAILED,             Precondition Failed)             \
  XX(413, PAYLOAD_TOO_LARGE,               Payload Too Large)               \
  XX(414, URI_TOO_LONG,                    URI Too Long)                    \
  XX(415, UNSUPPORTED_MEDIA_TYPE,          Unsupported Media Type)          \
  XX(416, RANGE_NOT_SATISFIABLE,           Range Not Satisfiable)           \
  XX(417, EXPECTATION_FAILED,              Expectation Failed)              \
  XX(421, MISDIRECTED_REQUEST,             Misdirected Request)             \
  XX(422, UNPROCESSABLE_ENTITY,            Unprocessable Entity)            \
  XX(423, LOCKED,                          Locked)                          \
  XX(424, FAILED_DEPENDENCY,               Failed Dependency)               \
  XX(426, UPGRADE_REQUIRED,                Upgrade Required)                \
  XX(428, PRECONDITION_REQUIRED,           Precondition Required)           \
  XX(429, TOO_MANY_REQUESTS,               Too Many Requests)               \
  XX(431, REQUEST_HEADER_FIELDS_TOO_LARGE, Request Header Fields Too Large) \
  XX(451, UNAVAILABLE_FOR_LEGAL_REASONS,   Unavailable For Legal Reasons)   \
  XX(500, INTERNAL_SERVER_ERROR,           Internal Server Error)           \
  XX(501, NOT_IMPLEMENTED,                 Not Implemented)                 \
  XX(502, BAD_GATEWAY,                     Bad Gateway)                     \
  XX(503, SERVICE_UNAVAILABLE,             Service Unavailable)             \
  XX(504, GATEWAY_TIMEOUT,                 Gateway Timeout)                 \
  XX(505, HTTP_VERSION_NOT_SUPPORTED,      HTTP Version Not Supported)      \
  XX(506, VARIANT_ALSO_NEGOTIATES,         Variant Also Negotiates)         \
  XX(507, INSUFFICIENT_STORAGE,            Insufficient Storage)            \
  XX(508, LOOP_DETECTED,                   Loop Detected)                   \
  XX(510, NOT_EXTENDED,                    Not Extended)                    \
  XX(511, NETWORK_AUTHENTICATION_REQUIRED, Network Authentication Required) \

enum http_status
  {
#define XX(num, name, string) HTTP_STATUS_##name = num,
  HTTP_STATUS_MAP(XX)
#undef XX
  };


/* Request Methods */
#define HTTP_METHOD_MAP(XX)         \
  XX(0,  DELETE,      DELETE)       \
  XX(1,  GET,         GET)          \
  XX(2,  HEAD,        HEAD)         \
  XX(3,  POST,        POST)         \
  XX(4,  PUT,         PUT)          \
  /* pathological */                \
  XX(5,  CONNECT,     CONNECT)      \
  XX(6,  OPTIONS,     OPTIONS)      \
  XX(7,  TRACE,       TRACE)        \
  /* WebDAV */                      \
  XX(8,  COPY,        COPY)         \
  XX(9,  LOCK,        LOCK)         \
  XX(10, MKCOL,       MKCOL)        \
  XX(11, MOVE,        MOVE)         \
  XX(12, PROPFIND,    PROPFIND)     \
  XX(13, PROPPATCH,   PROPPATCH)    \
  XX(14, SEARCH,      SEARCH)       \
  XX(15, UNLOCK,      UNLOCK)       \
  XX(16, BIND,        BIND)         \
  XX(17, REBIND,      REBIND)       \
  XX(18, UNBIND,      UNBIND)       \
  XX(19, ACL,         ACL)          \
  /* subversion */                  \
  XX(20, REPORT,      REPORT)       \
  XX(21, MKACTIVITY,  MKACTIVITY)   \
  XX(22, CHECKOUT,    CHECKOUT)     \
  XX(23, MERGE,       MERGE)        \
  /* upnp */                        \
  XX(24, MSEARCH,     M-SEARCH)     \
  XX(25, NOTIFY,      NOTIFY)       \
  XX(26, SUBSCRIBE,   SUBSCRIBE)    \
  XX(27, UNSUBSCRIBE, UNSUBSCRIBE)  \
  /* RFC-5789 */                    \
  XX(28, PATCH,       PATCH)        \
  XX(29, PURGE,       PURGE)        \
  /* CalDAV */                      \
  XX(30, MKCALENDAR,  MKCALENDAR)   \
  /* RFC-2068, section 19.6.1.2 */  \
  XX(31, LINK,        LINK)         \
  XX(32, UNLINK,      UNLINK)       \

enum http_method
  {
#define XX(num, name, string) HTTP_##name = num,
  HTTP_METHOD_MAP(XX)
#undef XX
  };


enum http_parser_type { HTTP_REQUEST, HTTP_RESPONSE, HTTP_BOTH };


/* Flag values for http_parser.flags field */
enum flags
  { F_CHUNKED               = 1 << 0
  , F_CONNECTION_KEEP_ALIVE = 1 << 1
  , F_CONNECTION_CLOSE      = 1 << 2
  , F_CONNECTION_UPGRADE    = 1 << 3
  , F_TRAILING              = 1 << 4
  , F_UPGRADE               = 1 << 5
  , F_SKIPBODY              = 1 << 6
  , F_CONTENTLENGTH         = 1 << 7
  };


/* Map for errno-related constants
 *
 * The provided argument should be a macro that takes 2 arguments.
 */
#define HTTP_ERRNO_MAP(XX)                                           \
  /* No error */                                                     \
  XX(OK, "success")                                                  \
                                                                     \
  /* Callback-related errors */                                      \
  XX(CB_message_begin, "the on_message_begin callback failed")       \
  XX(CB_url, "the on_url callback failed")                           \
  XX(CB_header_field, "the on_header_field callback failed")         \
  XX(CB_header_value, "the on_header_value callback failed")         \
  XX(CB_headers_complete, "the on_headers_complete callback failed") \
  XX(CB_body, "the on_body callback failed")                         \
  XX(CB_message_complete, "the on_message_complete callback failed") \
  XX(CB_status, "the on_status callback failed")                     \
  XX(CB_chunk_header, "the on_chunk_header callback failed")         \
  XX(CB_chunk_complete, "the on_chunk_complete callback failed")     \
                                                                     \
  /* Parsing-related errors */                                       \
  XX(INVALID_EOF_STATE, "stream ended at an unexpected time")        \
  XX(HEADER_OVERFLOW,                                                \
     "too many header bytes seen; overflow detected")                \
  XX(CLOSED_CONNECTION,                                              \
     "data received after completed connection: close message")      \
  XX(INVALID_VERSION, "invalid HTTP version")                        \
  XX(INVALID_STATUS, "invalid HTTP status code")                     \
  XX(INVALID_METHOD, "invalid HTTP method")                          \
  XX(INVALID_URL, "invalid URL")                                     \
  XX(INVALID_HOST, "invalid host")                                   \
  XX(INVALID_PORT, "invalid port")                                   \
  XX(INVALID_PATH, "invalid path")                                   \
  XX(INVALID_QUERY_STRING, "invalid query string")                   \
  XX(INVALID_FRAGMENT, "invalid fragment")                           \
  XX(LF_EXPECTED, "LF character expected")                           \
  XX(INVALID_HEADER_TOKEN, "invalid character in header")            \
  XX(INVALID_CONTENT_LENGTH,                                         \
     "invalid character in content-length header")                   \
  XX(UNEXPECTED_CONTENT_LENGTH,                                      \
     "unexpected content-length header")                             \
  XX(INVALID_CHUNK_SIZE,                                             \
     "invalid character in chunk size header")                       \
  XX(INVALID_CONSTANT, "invalid constant string")                    \
  XX(INVALID_INTERNAL_STATE, "encountered unexpected internal state")\
  XX(STRICT, "strict mode assertion failed")                         \
  XX(PAUSED, "parser is paused")                                     \
  XX(UNKNOWN, "an unknown error occurred")


/* Define HPE_* values for each errno value above */
#define HTTP_ERRNO_GEN(n, s) HPE_##n,
enum http_errno {
  HTTP_ERRNO_MAP(HTTP_ERRNO_GEN)
};
#undef HTTP_ERRNO_GEN


/* Get an http_errno value from an http_parser */
#define HTTP_PARSER_ERRNO(p)            ((enum http_errno) (p)->http_errno)


struct http_parser {
  /** PRIVATE **/
  unsigned int type : 2;         /* enum http_parser_type */
  unsigned int flags : 8;        /* F_* values from 'flags' enum; semi-public */
  unsigned int state : 7;        /* enum state from http_parser.c */
  unsigned int header_state : 7; /* enum header_state from http_parser.c */
  unsigned int index : 7;        /* index into current matcher */
  unsigned int lenient_http_headers : 1;

  uint32_t nread;          /* # bytes read in various scenarios */
  uint64_t content_length; /* # bytes in body (0 if no Content-Length header) */

  /** READ-ONLY **/
  unsigned short http_major;
  unsigned short http_minor;
  unsigned int status_code : 16; /* responses only */
  unsigned int method : 8;       /* requests only */
  unsigned int http_errno : 7;

  /* 1 = Upgrade header was present and the parser has exited because of that.
   * 0 = No upgrade header present.
   * Should be checked when http_parser_execute() returns in addition to
   * error checking.
   */
  unsigned int upgrade : 1;

  /** PUBLIC **/
  void *data; /* A pointer to get hook to the "connection" or "socket" object */
};


struct http_parser_settings {
  http_cb      on_message_begin;
  http_data_cb on_url;
  http_data_cb on_status;
  http_data_cb on_header_field;
  http_data_cb on_header_value;
  http_cb      on_headers_complete;
  http_data_cb on_body;
  http_cb      on_message_complete;
  /* When on_chunk_header is called, the current chunk length is stored
   * in parser->content_length.
   */
  http_cb      on_chunk_header;
  http_cb      on_chunk_complete;
};


enum http_parser_url_fields
  { UF_SCHEMA           = 0
  , UF_HOST             = 1
  , UF_PORT             = 2
  , UF_PATH             = 3
  , UF_QUERY            = 4
  , UF_FRAGMENT         = 5
  , UF_USERINFO         = 6
  , UF_MAX              = 7
  };


/* Result structure for http_parser_parse_url().
 *
 * Callers should index into field_data[] with UF_* values iff field_set
 * has the relevant (1 << UF_*) bit set. As a courtesy to clients (and
 * because we probably have padding left over), we convert any port to
 * a uint16_t.
 */
struct http_parser_url {
  uint16_t field_set;           /* Bitmask of (1 << UF_*) values */
  uint16_t port;                /* Converted UF_PORT string */

  struct {
    uint16_t off;               /* Offset into buffer in which field starts */
    uint16_t len;               /* Length of run in buffer */
  } field_data[UF_MAX];
};


/* Returns the library version. Bits 16-23 contain the major version number,
 * bits 8-15 the minor version number and bits 0-7 the patch level.
 * Usage example:
 *
 *   unsigned long version = http_parser_version();
 *   unsigned major = (version >> 16) & 255;
 *   unsigned minor = (version >> 8) & 255;
 *   unsigned patch = version & 255;
 *   printf("http_parser v%u.%u.%u\n", major, minor, patch);
 */
unsigned long http_parser_version(void);

void http_parser_init(http_parser *parser, enum http_parser_type type);


/* Initialize http_parser_settings members to 0
 */
void http_parser_settings_init(http_parser_settings *settings);


/* Executes the parser. Returns number of parsed bytes. Sets
 * `parser->http_errno` on error. */
uint32_t http_parser_execute(http_parser *parser,
                           const http_parser_settings *settings,
                           const char *data,
                           uint32_t len);


/* If http_should_keep_alive() in the on_headers_complete or
 * on_message_complete callback returns 0, then this should be
 * the last message on the connection.
 * If you are the server, respond with the "Connection: close" header.
 * If you are the client, close the connection.
 */
int http_should_keep_alive(const http_parser *parser);

/* Returns a string version of the HTTP method. */
const char *http_method_str(enum http_method m);

/* Return a string name of the given error */
const char *http_errno_name(enum http_errno err);

/* Return a string description of the given error */
const char *http_errno_description(enum http_errno err);

/* Initialize all http_parser_url members to 0 */
void http_parser_url_init(struct http_parser_url *u);

/* Parse a URL; return nonzero on failure */
int http_parser_parse_url(const char *buf, uint32_t buflen,
                          int is_connect,
                          struct http_parser_url *u);

/* Pause or un-pause the parser; a nonzero value pauses */
void http_parser_pause(http_parser *parser, int paused);

/* Checks if this is the final chunk of the body. */
int http_body_is_final(const http_parser *parser);

#ifdef __cplusplus
}
#endif
#endif