Method release_server_session

src/proxy/http/HttpSM.cc:5957–6008

void HttpSM::release_server_session() Called when we are not tunneling a response from the server. If the session is keep alive, release it back to the shared pool, otherwise close it

//   shared pool, otherwise close it
//
void
HttpSM::release_server_session(bool serve_from_cache)
{
  if (server_txn == nullptr) {
    return;
  }

  if (TS_SERVER_SESSION_SHARING_MATCH_NONE != t_state.txn_conf->server_session_sharing_match && t_state.current.server != nullptr &&
      t_state.current.server->keep_alive == HTTP_KEEPALIVE && t_state.hdr_info.server_response.valid() &&
      t_state.hdr_info.server_request.valid() &&
      (t_state.hdr_info.server_response.status_get() == HTTP_STATUS_NOT_MODIFIED ||
       (t_state.hdr_info.server_request.method_get_wksidx() == HTTP_WKSIDX_HEAD &&
        t_state.www_auth_content != HttpTransact::CACHE_AUTH_NONE)) &&
      plugin_tunnel_type == HTTP_NO_PLUGIN_TUNNEL && (!server_entry || !server_entry->eos)) {
    if (t_state.www_auth_content == HttpTransact::CACHE_AUTH_NONE || serve_from_cache == false) {
      // Must explicitly set the keep_alive_no_activity time before doing the release
      server_txn->set_inactivity_timeout(HRTIME_SECONDS(t_state.txn_conf->keep_alive_no_activity_timeout_out));
      server_txn->release();
    } else {
      // an authenticated server connection - attach to the local client
      // we are serving from cache for the current transaction
      t_state.www_auth_content = HttpTransact::CACHE_AUTH_SERVE;
      _ua.get_txn()->attach_server_session(static_cast<PoolableSession *>(server_txn->get_proxy_ssn()), false);
    }
  } else {
    server_txn->do_io_close();
    if (TS_SERVER_SESSION_SHARING_MATCH_NONE == t_state.txn_conf->server_session_sharing_match) {
      Metrics::Counter::increment(http_rsb.origin_shutdown_release_no_sharing);
    } else if (t_state.current.server == nullptr) {
      Metrics::Counter::increment(http_rsb.origin_shutdown_release_no_server);
    } else if (t_state.current.server->keep_alive != HTTP_KEEPALIVE) {
      Metrics::Counter::increment(http_rsb.origin_shutdown_release_no_keep_alive);
    } else if (!t_state.hdr_info.server_response.valid()) {
      Metrics::Counter::increment(http_rsb.origin_shutdown_release_invalid_response);
    } else if (!t_state.hdr_info.server_request.valid()) {
      Metrics::Counter::increment(http_rsb.origin_shutdown_release_invalid_request);
    } else if (t_state.hdr_info.server_response.status_get() != HTTP_STATUS_NOT_MODIFIED &&
               (t_state.hdr_info.server_request.method_get_wksidx() != HTTP_WKSIDX_HEAD ||
                t_state.www_auth_content == HttpTransact::CACHE_AUTH_NONE)) {
      Metrics::Counter::increment(http_rsb.origin_shutdown_release_modified);
    } else {
      Metrics::Counter::increment(http_rsb.origin_shutdown_release_misc);
    }
  }

  if (server_entry) {
    server_entry->vc        = nullptr;
    server_entry->read_vio  = nullptr;
    server_entry->write_vio = nullptr;
    server_entry            = nullptr;
  }
}

// void HttpSM::handle_post_failure()
//