I need to post some xml data to a remote point and then wait and listen for a reply.
This all seems to be going well except for the mystery of headers. I really don't know
what headers are really being sent to the remote url and wonder if libcurl adds in
things I don't know about.

I am doing this sort of thing :

    const char *verb = "POST / HTTP/1.1\r\nHost: some.correcturl.com\r\nContent-type: text/xml; charset=\"utf-8\"\r\n";
    char *query_buffer;
    char *input_buffer;
    size_t tu_query_length;

I check the size of my input xml file and calloc the buffer and read in the data :

    xml_stat = stat ( "./test.xml", &xmlfid );

    if ( xml_stat != 0 ) {
        perror ( "INPUT xml file Error: " );
        exit ( EXIT_FAILURE );
    }

    input_buffer = calloc( (size_t) xmlfid.st_size + 1,
                                   (size_t) sizeof( unsigned char ) );

then create my output to go to the remote point :

    strcpy ( query_buffer, verb );
    strcat ( query_buffer, input_buffer );

setup a few options and do the work :

    curl_global_init( CURL_GLOBAL_DEFAULT );

    curl = curl_easy_init();
    if ( curl ) {
        curl_easy_setopt ( curl, CURLOPT_URL,
                             "https://some.remoteurl.com/foo/bar.cgi" );

        curl_easy_setopt ( curl, CURLOPT_WRITEHEADER, headerfile );
        curl_easy_setopt ( curl, CURLOPT_STDERR, logfile );
        curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1L );
        curl_easy_setopt ( curl, CURLOPT_HEADER, 1L );
        curl_easy_setopt ( curl, CURLOPT_NOPROGRESS, 0L );
        curl_easy_setopt ( curl, CURLOPT_SSL_VERIFYPEER, 0L );
        curl_easy_setopt ( curl, CURLOPT_POST, 1L );

        /* Do not do the transfer - only connect to host */
        curl_easy_setopt ( curl, CURLOPT_CONNECT_ONLY, 1L);
        res = curl_easy_perform ( curl );

then I follow the sendrecv.c example to wait on the socket and get a reply .. which all seems to work.

However I always get a "HTTP/1.1 400 Bad Request" .

So I am curious what other headers is libcurl adding if any ?

Dennis

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Received on 2013-03-02