Method ModifyRequest

src/proxy/http/HttpTransact.cc:1400–1484

}

void
HttpTransact::ModifyRequest(State *s)
{
  int              scheme, hostname_len;
  HTTPHdr         &request      = s->hdr_info.client_request;
  static const int PORT_PADDING = 8;

  TxnDbg(dbg_ctl_http_trans, "START HttpTransact::ModifyRequest");

  // Initialize the state vars necessary to sending error responses
  bootstrap_state_variables_from_request(s, &request);

  ////////////////////////////////////////////////
  // If there is no scheme, default to http      //
  ////////////////////////////////////////////////
  URL *url = request.url_get();

  s->orig_scheme = (scheme = url->scheme_get_wksidx());

  s->method = request.method_get_wksidx();
  if (scheme < 0 && s->method != HTTP_WKSIDX_CONNECT) {
    if (s->client_info.port_attribute == HttpProxyPort::TRANSPORT_SSL) {
      url->scheme_set(URL_SCHEME_HTTPS, URL_LEN_HTTPS);
      s->orig_scheme = URL_WKSIDX_HTTPS;
    } else {
      url->scheme_set(URL_SCHEME_HTTP, URL_LEN_HTTP);
      s->orig_scheme = URL_WKSIDX_HTTP;
    }
  }

  if (s->method == HTTP_WKSIDX_CONNECT && !request.is_port_in_header()) {
    url->port_set(80);
  }

  // Ugly - this must come after the call to url->scheme_set or
  // it can't get the scheme properly and the wrong data is cached.
  // The solution should be to move the scheme detecting logic in to
  // the header class, rather than doing it in a random bit of
  // external code.
  const char *buf = request.host_get(&hostname_len);
  if (!request.is_target_in_url()) {
    s->hdr_info.client_req_is_server_style = true;
  }
  // Copy out buf to a hostname just in case its heap header memory is freed during coalescing
  // due to later HdrHeap operations
  char *hostname = static_cast<char *>(alloca(hostname_len + PORT_PADDING));
  memcpy(hostname, buf, hostname_len);

  // Make clang analyzer happy. hostname is non-null iff request.is_target_in_url().
  ink_assert(hostname || s->hdr_info.client_req_is_server_style);

  // If the incoming request is proxy-style make sure the Host: header
  // matches the incoming request URL. The exception is if we have
  // Max-Forwards set to 0 in the request
  int max_forwards = -1; // -1 is a valid value meaning that it didn't find the header
  if (request.presence(MIME_PRESENCE_MAX_FORWARDS)) {
    max_forwards = request.get_max_forwards();
  }