http.c

#ifdef HAVE_STRFTIME
      /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
      strftime(buf, BUFSIZE-1, "%a, %d %b %Y %H:%M:%S GMT", thistime);
#else
      /* TODO: Right, we *could* write a replacement here */
      strcpy(buf, "no strftime() support");
#endif
      switch(data->set.timecondition) {
      case CURL_TIMECOND_IFMODSINCE:
      default:
        add_bufferf(req_buffer,
                    "If-Modified-Since: %s\r\n", buf);
        break;
      case CURL_TIMECOND_IFUNMODSINCE:
        add_bufferf(req_buffer,
                    "If-Unmodified-Since: %s\r\n", buf);
        break;
      case CURL_TIMECOND_LASTMOD:
        add_bufferf(req_buffer,
                    "Last-Modified: %s\r\n", buf);
        break;
      }
    }

    while(headers) {
      char *ptr = strchr(headers->data, ':');
      if(ptr) {
        /* we require a colon for this to be a true header */

        ptr++; /* pass the colon */
        while(*ptr && isspace((int)*ptr))
          ptr++;

        if(*ptr) {
          /* only send this if the contents was non-blank */

          add_bufferf(req_buffer, "%s\r\n", headers->data);
        }
      }
      headers = headers->next;
    }

    http->postdata = NULL;  /* nothing to post at this point */
    Curl_pgrsSetUploadSize(data, 0); /* upload size is 0 atm */

    switch(data->set.httpreq) {

    case HTTPREQ_POST_FORM:
      if(Curl_FormInit(&http->form, http->sendit)) {
        failf(data, "Internal HTTP POST error!");
        return CURLE_HTTP_POST_ERROR;
      }

      /* set the read function to read from the generated form data */
      conn->fread = (curl_read_callback)Curl_FormReader;
      conn->fread_in = &http->form;

      http->sending = HTTPSEND_BODY;

      if(!conn->bits.upload_chunky)
        /* only add Content-Length if not uploading chunked */
        add_bufferf(req_buffer,
                    "Content-Length: %d\r\n", http->postsize);

      if(!checkheaders(data, "Expect:")) {
        /* if not disabled explicitly we add a Expect: 100-continue
           to the headers which actually speeds up post operations (as
           there is one packet coming back from the web server) */
        add_bufferf(req_buffer,
                    "Expect: 100-continue\r\n");
        data->set.expect100header = TRUE;
      }

      if(!checkheaders(data, "Content-Type:")) {
        /* Get Content-Type: line from Curl_FormReadOneLine, which happens
           to always be the first line. We can know this for sure since
           we always build the formpost linked list the same way!

           The Content-Type header line also contains the MIME boundary
           string etc why disabling this header is likely to not make things
           work, but we support it anyway.
        */
        char contentType[256];
        int linelength=0;
        linelength = Curl_FormReadOneLine (contentType,
                                           sizeof(contentType),
                                           1,
                                           (FILE *)&http->form);
        if(linelength == -1) {
          failf(data, "Could not get Content-Type header line!");
          return CURLE_HTTP_POST_ERROR;
        }
        add_buffer(req_buffer, contentType, linelength);
      }

      /* make the request end in a true CRLF */
      add_buffer(req_buffer, "\r\n", 2);

      /* set upload size to the progress meter */
      Curl_pgrsSetUploadSize(data, http->postsize);

      /* fire away the whole request to the server */
      result = add_buffer_send(req_buffer, conn->firstsocket, conn, 
                               &data->info.request_size);
      if(result)
        failf(data, "Failed sending POST request");
      else
        /* setup variables for the upcoming transfer */
        result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
                               &http->readbytecount,
                               conn->firstsocket,
                               &http->writebytecount);
      if(result) {
        Curl_formclean(http->sendit); /* free that whole lot */
        return result;
      }
      break;

    case HTTPREQ_PUT: /* Let's PUT the data to the server! */

      if((data->set.infilesize>0) && !conn->bits.upload_chunky)
        /* only add Content-Length if not uploading chunked */
        add_bufferf(req_buffer,
                    "Content-Length: %d\r\n", /* file size */
                    data->set.infilesize );

      add_bufferf(req_buffer, "\r\n");

      /* set the upload size to the progress meter */
      Curl_pgrsSetUploadSize(data, data->set.infilesize);

      /* this sends the buffer and frees all the buffer resources */
      result = add_buffer_send(req_buffer, conn->firstsocket, conn,
                               &data->info.request_size);
      if(result)
        failf(data, "Failed sending POST request");
      else
        /* prepare for transfer */
        result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
                               &http->readbytecount,
                               conn->firstsocket,
                               &http->writebytecount);
      if(result)
        return result;
      break;

    case HTTPREQ_POST:
      /* this is the simple POST, using x-www-form-urlencoded style */

      /* store the size of the postfields */
      postsize = data->set.postfieldsize?
        data->set.postfieldsize:
        (data->set.postfields?strlen(data->set.postfields):0);
      
      if(!conn->bits.upload_chunky) {
        /* We only set Content-Length and allow a custom Content-Length if
           we don't upload data chunked, as RFC2616 forbids us to set both
           kinds of headers (Transfer-Encoding: chunked and Content-Length) */

        if(!checkheaders(data, "Content-Length:"))
          /* we allow replacing this header, although it isn't very wise to
             actually set your own */
          add_bufferf(req_buffer, "Content-Length: %d\r\n", postsize);
      }

      if(!checkheaders(data, "Content-Type:"))
        add_bufferf(req_buffer,
                    "Content-Type: application/x-www-form-urlencoded\r\n");

      add_buffer(req_buffer, "\r\n", 2);

      /* and here we setup the pointers to the actual data */
      if(data->set.postfields) {

        if(!conn->bits.upload_chunky) {
          /* We have a static chunk of data to POST, and we're not sending
             it 'chunked', then we can just as well append it to the request
             already now to reduce the number if send() calls */
          add_buffer(req_buffer, data->set.postfields, postsize);
        }
        else {
          http->postsize = postsize;
          http->postdata = data->set.postfields;

          http->sending = HTTPSEND_BODY;

          conn->fread = (curl_read_callback)readmoredata;
          conn->fread_in = (void *)conn;

          /* set the upload size to the progress meter */
          Curl_pgrsSetUploadSize(data, http->postsize);
        }
      }
      else
        /* set the upload size to the progress meter */
        Curl_pgrsSetUploadSize(data, data->set.infilesize);

      /* issue the request, headers-only */
      result = add_buffer_send(req_buffer, conn->firstsocket, conn,
                               &data->info.request_size);

      if(result)
        failf(data, "Failed sending HTTP POST request");
      else
        result =
          Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
                        &http->readbytecount,
                        http->postdata?conn->firstsocket:-1,
                        http->postdata?&http->writebytecount:NULL);
      break;

    default:
      add_buffer(req_buffer, "\r\n", 2);
      
      /* issue the request */
      result = add_buffer_send(req_buffer, conn->firstsocket, conn,
                               &data->info.request_size);

      if(result)
        failf(data, "Failed sending HTTP request");
      else
        /* HTTP GET/HEAD download: */
        result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
                               &http->readbytecount,
                               http->postdata?conn->firstsocket:-1,
                               http->postdata?&http->writebytecount:NULL);
    }
    if(result)
      return result;
  }

  return CURLE_OK;
}
#endif