Cannot parse message without specifying Transfer-Encoding: chunked

[dxdx347]

Hello! I am trying to parse the following message:

HTTP/1.1 200 OK
Server: Cowboy
Date: Fri, 15 Jun 2018 10:30:14 GMT
Content-Type: application/json
Content-Length: 18
Via: 1.1 vegur
Expires: Fri, 15 Jun 2018 12:30:14 GMT
Connection: keep-alive

{"hello": "world"}

It returns content_length = 0. It only works if I add "Transfer-Encoding: chunked". This is my code:

struct http_parser parser;
static http_parser_settings settings = {
  .on_message_begin = on_info,
  .on_headers_complete = on_info,
  .on_message_complete = on_info,
  .on_header_field = on_data,
  .on_header_value = on_data,
  .on_url = on_data,
  .on_status = on_data,
  .on_body = on_data
};

static int on_info(http_parser* p)
{
    return 0;
}

static int on_data(http_parser* p, const char *at, size_t length)
{
    return 0;
}

http_parser_init(&parser, HTTP_BOTH);
size_t parsed;
parsed = http_parser_execute(&parser, &settings, httpMessage, strlen(httpMessage));
char body[500] = "";
strncpy(body, httpMessage+ parsed + 1, parser.content_length + 1);

Is this a bug? Or have I misconfigured something?

[dxdx347]

I've managed to read the body of the message by saving the number of bytes read in the callback on_headers_complete(). It was my misunderstanding of how the code works.

[ploxiln]

http_parser_execute() parsed the entire buffer you passed it, including the body. The body was passed to the on_body callback. After the entire http message was parsed, it reset to initial state to be ready to parse another message.

[indutny]

Was content_length available in on_message_complete callback? As @ploxiln said, the parser resets its state to initial to prepare for the next message.

[dxdx347]

I read the number of bytes parsed when headers complete callback is called, not the content length.

static int on_headers_complete(http_parser* p)
{
    dataStartIndex = p->nread;
    return 0;
}