return 0 from `http_data(struct http_roundtripper*, const char*, int size, int*)` when `size` is 0?

[bl4ck5un]

Hi, Thanks for this project!

Sometimes servers send responses without Content-Length and expect the client to consume input (for the body) until EOF. Basically renders recv to return 0 before the parser decides the stream is complete, which will result in an error.

    int ndata = recv(conn, buffer, sizeof(buffer), 0);
    if (ndata <= 0) {
        fprintf(stderr, "Error receiving data\n");
        http_free(&rt);
        close(conn);
        return -1;
    }

I wonder if this would be resolved by simply return 0 from http_data is the third parameter is passed as 0, i.e. EOF.

[JWebEmbDev]

Hi, I discoverd the same issue while receiving a HTTP 304 response, because the response must not contain a body.

http_date(..) already does recognize responses without Content-Length and sets state http_roundtripper_unknown_data, but the state won't be entered due to while(size){..} and size is 0, even if size==0 is handled in this state.

To work around this issue and be able to enter the state http_roundtripper_unknown_data, I've changed the while statement in http_date(..).

int http_data(struct http_roundtripper* rt, const char* data, int size, int* read)
{
    const int initial_size = size;
    while ( size
              || (http_roundtripper_unknown_data == rt->state) ) {..}
}