message: ClientConnectionPool: close pool-connection if server has closed it
diff: @@ -142,6 +142,12 @@ HttpRequestExecutor::executeOnce(const String& method,
  "[oatpp::web::client::HttpRequestExecutor::executeOnce()]: Failed to read response.");
  }
  + auto con_hdr = result.headers.getAsMemoryLabel<oatpp::data::share::StringKeyLabelCI>("Connection");
  + if (con_hdr == "close")
  + {
  + invalidateConnection(connectionHandle);
  + }
  +
  auto bodyStream = oatpp::data::stream::InputStreamBufferedProxy::createShared(connection,
  buffer,
  result.bufferPosStart,
  