// Forward the response using the thread of `handleUpstreamResponse`
						// to prevent concurrent access to forwardToEnvoy
						select {
						case forwardEnvoyCh <- resp:
						case <-con.stopChan:
						}
					})
				} else {
					// Otherwise, forward ECDS resource update directly to Envoy.
					forwardToEnvoy(con, resp)
				}
			default:
				if strings.HasPrefix(resp.TypeUrl, model.DebugType) {