CURLcode Curl_buffer_send(struct dynbuf *in,
                          struct connectdata *conn,
                          /* add the number of sent bytes to this
                             counter */
                          curl_off_t *bytes_written,
                          /* how much of the buffer contains body data */
                          size_t included_body_bytes,
                          int socketindex)
{
...
sendsize = CURLMIN(size, CURL_MAX_WRITE_SIZE);
...

else {
      if((size_t)amount != size)
        /* We have no continue-send mechanism now, fail. This can only happen
           when this function is used from the CONNECT sending function. We
           currently (stupidly) assume that the whole request is always sent
           away in the first single chunk.

           This needs FIXing.
        */
        return CURLE_SEND_ERROR;
    }
}