io.grpc.ForwardingServerCall.SimpleForwardingServerCall Java Examples

The following examples show how to use io.grpc.ForwardingServerCall.SimpleForwardingServerCall. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: TestServiceImpl.java    From grpc-nebula-java with Apache License 2.0 6 votes vote down vote up 
/**
 * Echo the request headers from a client into response headers and trailers. Useful for
 * testing end-to-end metadata propagation.
 */
private static ServerInterceptor echoRequestHeadersInterceptor(final Metadata.Key<?>... keys) {
  final Set<Metadata.Key<?>> keySet = new HashSet<>(Arrays.asList(keys));
  return new ServerInterceptor() {
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call,
        final Metadata requestHeaders,
        ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
            @Override
            public void sendHeaders(Metadata responseHeaders) {
              responseHeaders.merge(requestHeaders, keySet);
              super.sendHeaders(responseHeaders);
            }

            @Override
            public void close(Status status, Metadata trailers) {
              trailers.merge(requestHeaders, keySet);
              super.close(status, trailers);
            }
          }, requestHeaders);
    }
  };
}
Example #2
Source File: BaseITTracingServerInterceptor.java    From brave with Apache License 2.0 6 votes vote down vote up 
@Test public void userInterceptor_throwsOnClose() throws IOException {
  init(new ServerInterceptor() {
    @Override public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call, Metadata metadata, ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override public void close(Status status, Metadata trailers) {
          throw new IllegalStateException("I'm a bad interceptor.");
        }
      }, metadata);
    }
  });

  assertThatThrownBy(() -> GreeterGrpc.newBlockingStub(client).sayHello(HELLO_REQUEST))
      .isInstanceOf(StatusRuntimeException.class);
  testSpanHandler.takeRemoteSpanWithErrorMessage(Span.Kind.SERVER, "I'm a bad interceptor.");
}
Example #3
Source File: BaseITTracingServerInterceptor.java    From brave with Apache License 2.0 6 votes vote down vote up 
@Test public void userInterceptor_throwsOnSendMessage() throws IOException {
  init(new ServerInterceptor() {
    @Override public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call, Metadata metadata, ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override public void sendMessage(RespT message) {
          throw new IllegalStateException("I'm a bad interceptor.");
        }
      }, metadata);
    }
  });

  assertThatThrownBy(() -> GreeterGrpc.newBlockingStub(client).sayHello(HELLO_REQUEST))
      .isInstanceOf(StatusRuntimeException.class);
  testSpanHandler.takeRemoteSpanWithErrorMessage(Span.Kind.SERVER, "I'm a bad interceptor.");
}
Example #4
Source File: TestServiceImpl.java    From grpc-java with Apache License 2.0 6 votes vote down vote up 
/**
 * Echoes request headers with the specified key(s) from a client into response trailers only.
 */
private static ServerInterceptor echoRequestMetadataInTrailers(final Metadata.Key<?>... keys) {
  final Set<Metadata.Key<?>> keySet = new HashSet<>(Arrays.asList(keys));
  return new ServerInterceptor() {
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call,
        final Metadata requestHeaders,
        ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override
        public void sendHeaders(Metadata responseHeaders) {
          super.sendHeaders(responseHeaders);
        }

        @Override
        public void close(Status status, Metadata trailers) {
          trailers.merge(requestHeaders, keySet);
          super.close(status, trailers);
        }
      }, requestHeaders);
    }
  };
}
Example #5
Source File: TestServiceImpl.java    From grpc-java with Apache License 2.0 6 votes vote down vote up 
/**
 * Echoes request headers with the specified key(s) from a client into response headers only.
 */
private static ServerInterceptor echoRequestMetadataInHeaders(final Metadata.Key<?>... keys) {
  final Set<Metadata.Key<?>> keySet = new HashSet<>(Arrays.asList(keys));
  return new ServerInterceptor() {
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call,
        final Metadata requestHeaders,
        ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override
        public void sendHeaders(Metadata responseHeaders) {
          responseHeaders.merge(requestHeaders, keySet);
          super.sendHeaders(responseHeaders);
        }

        @Override
        public void close(Status status, Metadata trailers) {
          super.close(status, trailers);
        }
      }, requestHeaders);
    }
  };
}
Example #6
Source File: TestServiceImpl.java    From grpc-java with Apache License 2.0 6 votes vote down vote up 
/**
 * Echo the request headers from a client into response headers and trailers. Useful for
 * testing end-to-end metadata propagation.
 */
private static ServerInterceptor echoRequestHeadersInterceptor(final Metadata.Key<?>... keys) {
  final Set<Metadata.Key<?>> keySet = new HashSet<>(Arrays.asList(keys));
  return new ServerInterceptor() {
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call,
        final Metadata requestHeaders,
        ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
            @Override
            public void sendHeaders(Metadata responseHeaders) {
              responseHeaders.merge(requestHeaders, keySet);
              super.sendHeaders(responseHeaders);
            }

            @Override
            public void close(Status status, Metadata trailers) {
              trailers.merge(requestHeaders, keySet);
              super.close(status, trailers);
            }
          }, requestHeaders);
    }
  };
}
Example #7
Source File: GrpcServiceServerTest.java    From armeria with Apache License 2.0 6 votes vote down vote up 
@Override
public <REQ, RESP> Listener<REQ> interceptCall(ServerCall<REQ, RESP> call, Metadata headers,
                                               ServerCallHandler<REQ, RESP> next) {
    if (!call.getMethodDescriptor().equals(UnitTestServiceGrpc.getErrorReplaceExceptionMethod())) {
        return next.startCall(call, headers);
    }
    return next.startCall(new SimpleForwardingServerCall<REQ, RESP>(call) {
        @Override
        public void close(Status status, Metadata trailers) {
            if (status.getCause() instanceof IllegalStateException &&
                status.getCause().getMessage().equals("This error should be replaced")) {
                status = status.withDescription("Error was replaced");
            }
            delegate().close(status, trailers);
        }
    }, headers);
}
Example #8
Source File: ConnectionInterceptor.java    From rpc-bench with Apache License 2.0 6 votes vote down vote up 
@SuppressWarnings("checkstyle:MethodTypeParameterName")
@Override
public <ReqT, RespT> Listener<ReqT> interceptCall(
    final ServerCall<ReqT, RespT> call, final Metadata headers,
    final ServerCallHandler<ReqT, RespT> next) {
  TL.set(call);

  return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
    @Override
    public void close(final Status status, final Metadata trailers) {
      super.close(status, trailers);
      TL.remove();
    }

  }, headers);
}
Example #9
Source File: MonitoringInterceptor.java    From feast with Apache License 2.0 6 votes vote down vote up 
@Override
public <ReqT, RespT> Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {

  long startCallMillis = System.currentTimeMillis();
  String fullMethodName = call.getMethodDescriptor().getFullMethodName();
  String serviceName = MethodDescriptor.extractFullServiceName(fullMethodName);
  String methodName = fullMethodName.substring(fullMethodName.indexOf("/") + 1);

  return next.startCall(
      new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override
        public void close(Status status, Metadata trailers) {
          GrpcMetrics.requestLatency
              .labels(serviceName, methodName, status.getCode().name())
              .observe((System.currentTimeMillis() - startCallMillis) / 1000f);
          super.close(status, trailers);
        }
      },
      headers);
}
Example #10
Source File: GrpcMonitoringInterceptor.java    From feast with Apache License 2.0 6 votes vote down vote up 
@Override
public <ReqT, RespT> Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {

  long startCallMillis = System.currentTimeMillis();
  String fullMethodName = call.getMethodDescriptor().getFullMethodName();
  String methodName = fullMethodName.substring(fullMethodName.indexOf("/") + 1);

  return next.startCall(
      new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override
        public void close(Status status, Metadata trailers) {
          Metrics.requestLatency
              .labels(methodName)
              .observe((System.currentTimeMillis() - startCallMillis) / 1000f);
          Metrics.grpcRequestCount.labels(methodName, status.getCode().name()).inc();
          super.close(status, trailers);
        }
      },
      headers);
}
Example #11
Source File: TestServiceImpl.java    From grpc-nebula-java with Apache License 2.0 6 votes vote down vote up 
/**
 * Echoes request headers with the specified key(s) from a client into response trailers only.
 */
private static ServerInterceptor echoRequestMetadataInTrailers(final Metadata.Key<?>... keys) {
  final Set<Metadata.Key<?>> keySet = new HashSet<>(Arrays.asList(keys));
  return new ServerInterceptor() {
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call,
        final Metadata requestHeaders,
        ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override
        public void sendHeaders(Metadata responseHeaders) {
          super.sendHeaders(responseHeaders);
        }

        @Override
        public void close(Status status, Metadata trailers) {
          trailers.merge(requestHeaders, keySet);
          super.close(status, trailers);
        }
      }, requestHeaders);
    }
  };
}
Example #12
Source File: TestServiceImpl.java    From grpc-nebula-java with Apache License 2.0 6 votes vote down vote up 
/**
 * Echoes request headers with the specified key(s) from a client into response headers only.
 */
private static ServerInterceptor echoRequestMetadataInHeaders(final Metadata.Key<?>... keys) {
  final Set<Metadata.Key<?>> keySet = new HashSet<>(Arrays.asList(keys));
  return new ServerInterceptor() {
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call,
        final Metadata requestHeaders,
        ServerCallHandler<ReqT, RespT> next) {
      return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override
        public void sendHeaders(Metadata responseHeaders) {
          responseHeaders.merge(requestHeaders, keySet);
          super.sendHeaders(responseHeaders);
        }

        @Override
        public void close(Status status, Metadata trailers) {
          super.close(status, trailers);
        }
      }, requestHeaders);
    }
  };
}
Example #13
Source File: DebugInterceptorTest.java    From grpc-java-contrib with BSD 3-Clause "New" or "Revised" License 5 votes vote down vote up 
@Test
public void debugServerInterceptTest() {
    LinkedList<String> logs = new LinkedList<String>();
    Metadata requestHeaders = new Metadata();
    requestHeaders.put(Metadata.Key.of("request_header", Metadata.ASCII_STRING_MARSHALLER), "request_header_value");
    // Setup
    serverRule.getServiceRegistry().addService(ServerInterceptors.intercept(svc, new ServerInterceptor() {
        @Override
        public <ReqT, RespT> Listener<ReqT> interceptCall(ServerCall<ReqT, RespT> call, Metadata headers,
                ServerCallHandler<ReqT, RespT> next) {
            return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
                @Override
                public void sendHeaders(Metadata responseHeaders) {
                    responseHeaders.put(Metadata.Key.of("response_header", Metadata.ASCII_STRING_MARSHALLER),
                            "response_header_value");
                    super.sendHeaders(responseHeaders);
                }
            }, headers);
        }
    }, new DebugServerInterceptor(DebugServerInterceptor.Level.METHOD, DebugServerInterceptor.Level.MESSAGE,
            DebugServerInterceptor.Level.HEADERS) {
        @Override
        protected void log(String logmessage) {
            logs.add(logmessage);
        }
    }));
    GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(serverRule.getChannel())
            .withInterceptors(MetadataUtils.newAttachHeadersInterceptor(requestHeaders));
    stub.sayHello(HelloRequest.newBuilder().setName("World").build());
    assertThat(logs.poll()).contains("SayHello"); // request method name
    assertThat(logs.poll()).contains("request_header_value"); // request header value
    assertThat(logs.poll()).contains("World"); // request message
    assertThat(logs.poll()).contains("SayHello"); // response method name
    assertThat(logs.poll()).contains("response_header_value"); // response header
    assertThat(logs.poll()).contains("Hello World"); // response message

}
Example #14
Source File: DebugInterceptorTest.java    From grpc-java-contrib with BSD 3-Clause "New" or "Revised" License 5 votes vote down vote up 
@Test
public void debugClientInterceptTest() {
    LinkedList<String> logs = new LinkedList<String>();
    Metadata requestHeaders = new Metadata();
    requestHeaders.put(Metadata.Key.of("request_header", Metadata.ASCII_STRING_MARSHALLER), "request_header_value");
    // Setup
    serverRule.getServiceRegistry().addService(ServerInterceptors.intercept(svc, new ServerInterceptor() {
        @Override
        public <ReqT, RespT> Listener<ReqT> interceptCall(ServerCall<ReqT, RespT> call, Metadata headers,
                ServerCallHandler<ReqT, RespT> next) {
            return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
                @Override
                public void sendHeaders(Metadata responseHeaders) {
                    responseHeaders.put(Metadata.Key.of("response_header", Metadata.ASCII_STRING_MARSHALLER),
                            "response_header_value");
                    super.sendHeaders(responseHeaders);
                }
            }, headers);
        }
    }));
    GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(serverRule.getChannel())
            .withInterceptors(new DebugClientInterceptor(Level.STATUS, Level.HEADERS, Level.MESSAGE) {
                @Override
                protected void log(String message) {
                    logs.add(message);
                }

            }, MetadataUtils.newAttachHeadersInterceptor(requestHeaders));

    stub.sayHello(HelloRequest.newBuilder().setName("World").build());
    assertThat(logs.poll()).contains("SayHello"); // request method name
    assertThat(logs.poll()).contains(requestHeaders.toString()); // request header value
    assertThat(logs.poll()).contains("World"); // request message
    assertThat(logs.poll()).contains("response_header_value"); // response header
    assertThat(logs.poll()).contains("Hello World"); // response message
    assertThat(logs.poll()).contains("0 OK"); // response status
}
Example #15
Source File: HeaderServerInterceptor.java    From grpc-nebula-java with Apache License 2.0 5 votes vote down vote up 
@Override
public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call,
    final Metadata requestHeaders,
    ServerCallHandler<ReqT, RespT> next) {
  logger.info("header received from client:" + requestHeaders);
  return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
    @Override
    public void sendHeaders(Metadata responseHeaders) {
      responseHeaders.put(CUSTOM_HEADER_KEY, "customRespondValue");
      super.sendHeaders(responseHeaders);
    }
  }, requestHeaders);
}
Example #16
Source File: HeaderServerInterceptor.java    From grpc-java with Apache License 2.0 5 votes vote down vote up 
@Override
public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call,
    final Metadata requestHeaders,
    ServerCallHandler<ReqT, RespT> next) {
  logger.info("header received from client:" + requestHeaders);
  return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
    @Override
    public void sendHeaders(Metadata responseHeaders) {
      responseHeaders.put(CUSTOM_HEADER_KEY, "customRespondValue");
      super.sendHeaders(responseHeaders);
    }
  }, requestHeaders);
}
Example #17
Source File: OrcaMetricReportingServerInterceptor.java    From grpc-java with Apache License 2.0 5 votes vote down vote up 
@Override
public <ReqT, RespT> Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {
  Context ctx = Context.current();
  CallMetricRecorder callMetricRecorder = InternalCallMetricRecorder.CONTEXT_KEY.get(ctx);
  if (callMetricRecorder == null) {
    callMetricRecorder = InternalCallMetricRecorder.newCallMetricRecorder();
    ctx = ctx.withValue(InternalCallMetricRecorder.CONTEXT_KEY, callMetricRecorder);
  }
  final CallMetricRecorder finalCallMetricRecorder = callMetricRecorder;
  ServerCall<ReqT, RespT> trailerAttachingCall =
      new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override
        public void close(Status status, Metadata trailers) {
          Map<String, Double> metricValues =
              InternalCallMetricRecorder.finalizeAndDump(finalCallMetricRecorder);
          // Only attach a metric report if there are some metric values to be reported.
          if (!metricValues.isEmpty()) {
            OrcaLoadReport report =
                OrcaLoadReport.newBuilder().putAllRequestCost(metricValues).build();
            trailers.put(ORCA_ENDPOINT_LOAD_METRICS_KEY, report);
          }
          super.close(status, trailers);
        }
      };
  return Contexts.interceptCall(
      ctx,
      trailerAttachingCall,
      headers,
      next);
}
Example #18
Source File: TestSdsServer.java    From grpc-java with Apache License 2.0 5 votes vote down vote up 
@Override
public <ReqT, RespT> Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call,
    Metadata requestHeaders,
    ServerCallHandler<ReqT, RespT> next) {
  lastK8sJwtTokenValue = null;
  byte[] value =
      requestHeaders.get(SdsClientFileBasedMetadataTest.K8S_SA_JWT_TOKEN_HEADER_METADATA_KEY);
  if (value != null) {
    lastK8sJwtTokenValue = new String(value, StandardCharsets.UTF_8);
  }
  return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {}, requestHeaders);
}
Example #19
Source File: HeaderServerInterceptor.java    From grpc-nebula-java with Apache License 2.0 5 votes vote down vote up 
@Override
public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call,
    final Metadata requestHeaders,
    ServerCallHandler<ReqT, RespT> next) {
  logger.info("服务端拦截器：header received from client:" + requestHeaders);
  return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
    @Override
    public void sendHeaders(Metadata responseHeaders) {
      responseHeaders.put(CUSTOM_HEADER_KEY, "customRespondValue");
      super.sendHeaders(responseHeaders);
    }
  }, requestHeaders);
}
Example #20
Source File: BaseITTracingServerInterceptor.java    From brave with Apache License 2.0 4 votes vote down vote up 
/**
 * This shows that a {@link ServerInterceptor} can see the server server span when processing the
 * request and response.
 */
@Test public void bodyTaggingExample() throws IOException {
  SpanCustomizer customizer = CurrentSpanCustomizer.create(tracing);
  AtomicInteger sends = new AtomicInteger();
  AtomicInteger recvs = new AtomicInteger();

  init(new ServerInterceptor() {
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {
      call = new SimpleForwardingServerCall<ReqT, RespT>(call) {
        @Override public void sendMessage(RespT message) {
          delegate().sendMessage(message);
          customizer.tag("grpc.message_send." + sends.getAndIncrement(), message.toString());
        }
      };
      return new SimpleForwardingServerCallListener<ReqT>(next.startCall(call, headers)) {
        @Override public void onMessage(ReqT message) {
          customizer.tag("grpc.message_recv." + recvs.getAndIncrement(), message.toString());
          delegate().onMessage(message);
        }
      };
    }
  });

  GreeterGrpc.newBlockingStub(client).sayHello(HELLO_REQUEST);

  assertThat(testSpanHandler.takeRemoteSpan(Span.Kind.SERVER).tags()).containsKeys(
      "grpc.message_recv.0", "grpc.message_send.0"
  );

  Iterator<HelloReply> replies = GreeterGrpc.newBlockingStub(client)
      .sayHelloWithManyReplies(HELLO_REQUEST);
  assertThat(replies).toIterable().hasSize(10);

  // Intentionally verbose here to show that only one recv and 10 replies
  assertThat(testSpanHandler.takeRemoteSpan(Span.Kind.SERVER).tags()).containsKeys(
      "grpc.message_recv.1",
      "grpc.message_send.1",
      "grpc.message_send.2",
      "grpc.message_send.3",
      "grpc.message_send.4",
      "grpc.message_send.5",
      "grpc.message_send.6",
      "grpc.message_send.7",
      "grpc.message_send.8",
      "grpc.message_send.9",
      "grpc.message_send.10"
  );
}
Example #21
Source File: GrpcClientTest.java    From armeria with Apache License 2.0 4 votes vote down vote up 
@Override
protected void configure(ServerBuilder sb) {
    sb.workerGroup(EventLoopGroups.newEventLoopGroup(1), true);
    sb.maxRequestLength(MAX_MESSAGE_SIZE);
    sb.idleTimeoutMillis(0);
    sb.http(0);
    sb.https(0);
    sb.tlsSelfSigned();

    final ServerServiceDefinition interceptService =
            ServerInterceptors.intercept(
                    new TestServiceImpl(Executors.newSingleThreadScheduledExecutor()),
                    new ServerInterceptor() {
                        @Override
                        public <REQ, RESP> Listener<REQ> interceptCall(
                                ServerCall<REQ, RESP> call,
                                Metadata requestHeaders,
                                ServerCallHandler<REQ, RESP> next) {
                            final HttpHeadersBuilder fromClient = HttpHeaders.builder();
                            MetadataUtil.fillHeaders(requestHeaders, fromClient);
                            CLIENT_HEADERS_CAPTURE.set(fromClient.build());
                            return next.startCall(
                                    new SimpleForwardingServerCall<REQ, RESP>(call) {
                                        @Override
                                        public void close(Status status, Metadata trailers) {
                                            trailers.merge(requestHeaders);
                                            super.close(status, trailers);
                                        }
                                    }, requestHeaders);
                        }
                    });

    sb.serviceUnder("/",
                    GrpcService.builder()
                               .addService(interceptService)
                               .setMaxInboundMessageSizeBytes(MAX_MESSAGE_SIZE)
                               .setMaxOutboundMessageSizeBytes(MAX_MESSAGE_SIZE)
                               .useClientTimeoutHeader(false)
                               .build()
                               .decorate((client, ctx, req) -> {
                                   final HttpResponse res = client.serve(ctx, req);
                                   return new FilteredHttpResponse(res) {
                                       private boolean headersReceived;

                                       @Override
                                       protected HttpObject filter(HttpObject obj) {
                                           if (obj instanceof HttpHeaders) {
                                               if (!headersReceived) {
                                                   headersReceived = true;
                                               } else {
                                                   SERVER_TRAILERS_CAPTURE.set((HttpHeaders) obj);
                                               }
                                           }
                                           return obj;
                                       }
                                   };
                               }));
}