Method build_error_response

src/proxy/http/HttpTransact.cc:8024–8184

///////////////////////////////////////////////////////////////////////// void HttpTransact::build_error_response( State *s, HTTPStatus status_code, char *reason_phrase_or_null, char *error_body_type, char *format, ...) This method sets the requires state for an error reply, including the error text, status code, reason phrase, and reply headers. The caller calls the method with the HttpTransac

//
//////////////////////////////////////////////////////////////////////////////
void
HttpTransact::build_error_response(State *s, HTTPStatus status_code, const char *reason_phrase_or_null, const char *error_body_type)
{
  char body_language[256], body_type[256];

  if (nullptr == error_body_type) {
    error_body_type = "default";
  }

  // Make sure that if this error occurred before we initialized the state variables that we do now.
  initialize_state_variables_from_request(s, &s->hdr_info.client_request);

  //////////////////////////////////////////////////////
  //  If there is a request body, we must disable     //
  //  keep-alive to prevent the body being read as    //
  //  the next header (unless we've already drained   //
  //  which we do for NTLM auth)                      //
  //////////////////////////////////////////////////////
  if (status_code == HTTP_STATUS_REQUEST_TIMEOUT || s->hdr_info.client_request.get_content_length() != 0 ||
      s->client_info.transfer_encoding == HttpTransact::CHUNKED_ENCODING) {
    s->client_info.keep_alive = HTTP_NO_KEEPALIVE;
  } else {
    // We don't have a request body.  Since we are
    //  generating the error, we know we can trust
    //  the content-length
    s->hdr_info.trust_response_cl = true;
  }
  // If transparent and the forward server connection looks unhappy don't
  // keep alive the ua connection.
  if ((s->state_machine->get_ua_txn() && s->state_machine->get_ua_txn()->is_outbound_transparent()) &&
      (status_code == HTTP_STATUS_INTERNAL_SERVER_ERROR || status_code == HTTP_STATUS_GATEWAY_TIMEOUT ||
       status_code == HTTP_STATUS_BAD_GATEWAY || status_code == HTTP_STATUS_SERVICE_UNAVAILABLE)) {
    s->client_info.keep_alive = HTTP_NO_KEEPALIVE;
  }

  // If there is a parse error on reading the request it can leave reading the request stream in an undetermined state
  if (status_code == HTTP_STATUS_BAD_REQUEST) {
    s->client_info.keep_alive = HTTP_NO_KEEPALIVE;
  }

  switch (status_code) {
  case HTTP_STATUS_BAD_REQUEST:
    SET_VIA_STRING(VIA_CLIENT_REQUEST, VIA_CLIENT_ERROR);
    // Did the via error already get set by the loop detection
    if (s->via_string[VIA_ERROR_TYPE] != VIA_ERROR_LOOP_DETECTED) {
      SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_HEADER_SYNTAX);
    }
    break;
  case HTTP_STATUS_BAD_GATEWAY:
    SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_CONNECTION);
    break;
  case HTTP_STATUS_GATEWAY_TIMEOUT:
    SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_TIMEOUT);
    break;
  case HTTP_STATUS_NOT_FOUND:
    SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_SERVER);
    break;
  case HTTP_STATUS_FORBIDDEN: