Function httpWriteResponse

cups/http.c:3389–3608

 */

int					/* O - 0 on success, -1 on error */
httpWriteResponse(http_t        *http,	/* I - HTTP connection */
		  http_status_t status)	/* I - Status code */
{
  http_encoding_t	old_encoding;	/* Old data_encoding value */
  off_t			old_remaining;	/* Old data_remaining value */
  cups_lang_t		*lang;		/* Response language */


 /*
  * Range check input...
  */

  DEBUG_printf(("httpWriteResponse(http=%p, status=%d)", (void *)http, status));

  if (!http || status < HTTP_STATUS_CONTINUE)
  {
    DEBUG_puts("1httpWriteResponse: Bad input.");
    return (-1);
  }

 /*
  * Set the various standard fields if they aren't already...
  */

  if (!http->fields[HTTP_FIELD_DATE])
    httpSetField(http, HTTP_FIELD_DATE, httpGetDateString(time(NULL)));

  if (status >= HTTP_STATUS_BAD_REQUEST && http->keep_alive)
  {
    http->keep_alive = HTTP_KEEPALIVE_OFF;
    httpSetField(http, HTTP_FIELD_KEEP_ALIVE, "");
  }

  if (http->version == HTTP_VERSION_1_1)
  {
    if (!http->fields[HTTP_FIELD_CONNECTION])
    {
      if (http->keep_alive)
	httpSetField(http, HTTP_FIELD_CONNECTION, "Keep-Alive");
      else
	httpSetField(http, HTTP_FIELD_CONNECTION, "close");
    }

    if (http->keep_alive && !http->fields[HTTP_FIELD_KEEP_ALIVE])
      httpSetField(http, HTTP_FIELD_KEEP_ALIVE, "timeout=10");
  }

#ifdef HAVE_TLS
  if (status == HTTP_STATUS_UPGRADE_REQUIRED ||
      status == HTTP_STATUS_SWITCHING_PROTOCOLS)
  {
    if (!http->fields[HTTP_FIELD_CONNECTION])
      httpSetField(http, HTTP_FIELD_CONNECTION, "Upgrade");

    if (!http->fields[HTTP_FIELD_UPGRADE])
      httpSetField(http, HTTP_FIELD_UPGRADE, "TLS/1.2,TLS/1.1,TLS/1.0");