Question

我想使用拦截器为通过rest模板发出的每个请求添加授权标头。我是这样做的：

{
  "Type": "AWS::EC2::Instance",
  "Properties": {
      "BlockDeviceMappings": [
          {
              "DeviceName": "/dev/sda1",
              "Ebs" : { "SnapshotId" : {"Ref": "Snapshot1Id"} }
          },
          {
              "DeviceName": "/dev/sda2",
              "Ebs" : { "SnapshotId" : {"Ref": "Snapshot2Id"} }
          },
          {
              "DeviceName": "/dev/sda3",
              "Ebs" : { "SnapshotId" : {"Ref": "Snapshot3Id"} }
          }
      ],
      "ImageId": { "Ref": "InstanceAmi" }
}

但是当我这样做时

public FirebaseCloudMessagingRestTemplate(@Autowired RestTemplateBuilder builder, @Value("fcm.server-key") String serverKey) {
    builder.additionalInterceptors(new ClientHttpRequestInterceptor() {
        @Override
        public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
            request.getHeaders().add("Authorization", "key=" + serverKey);
            System.out.println(request.getHeaders());
            return execution.execute(request, body);
        }
    });
    this.restTemplate = builder.build();
}

没有调用拦截器（Iv在其中放置了断点并且没有触发）。发出请求并返回明显丢失的auth key响应。为什么我的拦截器没有被调用？

Answer 1

好的我知道发生了什么事。在检查build()实现后，我发现RestTemplateBuilder在调用additionalInterceptors时没有改变自身状态，但返回了一个带有给定拦截器的新构建器。链接调用解决了这个问题。

public FirebaseCloudMessagingRestTemplate(final @Autowired RestTemplateBuilder builder, final @Value("${fcm.server-key}") String serverKey) {
    this.restTemplate = builder.additionalInterceptors((request, body, execution) -> {
        request.getHeaders().add("Authorization", "key=" + serverKey);
        log.debug("Adding authorization header");
        return execution.execute(request, body);
    }).build();
}

为什么我的RestTemplate ClientHttpRequestInterceptor没有被调用？

1 个答案: