Method do_remap_request

src/proxy/http/HttpSM.cc:4430–4498

}

void
HttpSM::do_remap_request(bool run_inline)
{
  SMDbg(dbg_ctl_http_seq, "Remapping request");
  SMDbg(dbg_ctl_url_rewrite, "Starting a possible remapping for request");
  bool ret = remapProcessor.setup_for_remap(&t_state, m_remap);

  check_sni_host();

  // Depending on a variety of factors the HOST field may or may not have been promoted to the
  // client request URL. The unmapped URL should always have that promotion done. If the HOST field
  // is not already there, promote it only in the unmapped_url. This avoids breaking any logic that
  // depends on the lack of promotion in the client request URL.
  if (!t_state.unmapped_url.m_url_impl->m_ptr_host) {
    MIMEField *host_field = t_state.hdr_info.client_request.field_find(MIME_FIELD_HOST, MIME_LEN_HOST);
    if (host_field) {
      auto host_name{host_field->value_get()};
      if (!host_name.empty()) {
        int port = -1;
        // Host header can contain port number, and if it does we need to set host and port separately to unmapped_url.
        // If header value starts with '[', the value must contain an IPv6 address, and it may contain a port number as well.
        if (host_name.starts_with("["sv)) { // IPv6
          host_name.remove_prefix(1);       // Skip '['
          // If header value ends with ']', the value must only contain an IPv6 address (no port number).
          if (host_name.ends_with("]"sv)) { // Without port number
            host_name.remove_suffix(1);     // Exclude ']'
          } else {                          // With port number
            for (int idx = host_name.length() - 1; idx > 0; idx--) {
              if (host_name[idx] == ':') {
                port      = ink_atoi(host_name.data() + idx + 1, host_name.length() - (idx + 1));
                host_name = host_name.substr(0, idx);
                break;
              }
            }
          }
        } else { // Anything else (Hostname or IPv4 address)
          // If the value contains ':' where it does not have IPv6 address, there must be port number
          if (const char *colon = static_cast<const char *>(memchr(host_name.data(), ':', host_name.length()));
              colon == nullptr) { // Without port number
            // Nothing to adjust. Entire value should be used as hostname.
          } else { // With port number
            port      = ink_atoi(colon + 1, host_name.length() - ((colon + 1) - host_name.data()));
            host_name = host_name.substr(0, colon - host_name.data());
          }
        }

        // Set values
        t_state.unmapped_url.host_set(host_name.data(), host_name.length());
        if (port >= 0) {
          t_state.unmapped_url.port_set(port);
        }
      }
    }
  }

  if (!ret) {
    SMDbg(dbg_ctl_url_rewrite, "Could not find a valid remapping entry for this request");
    Metrics::Counter::increment(http_rsb.no_remap_matched);