java - 将 HTTP header 从 AWS API 传递到 Lambda 函数

Question

我正在尝试使用 java 获取 AWS Lambda 函数中的 HTTP header 和正文详细信息，这些信息是使用 AWS API 通过 POST 方法发送的。到目前为止，我已经成功设置了 AWS API 和 AWS Lambda Function 之间的连接，并且能够从 API Gateway 调用它。现在，要将 header 传递给 Lambda 函数，我已完成 here 中的“更新 lambda 函数”之前的所有步骤。 。以下是我的 lambda 代码:

    import com.amazonaws.Request;
    import com.amazonaws.Response;
    import com.amazonaws.services.lambda.runtime.Context;
    import com.amazonaws.services.lambda.runtime.RequestHandler;
    import com.amazonaws.services.lambda.runtime.events.S3Event;

    public class SimpleSysout implements RequestHandler<Request, String> {
        public String handleRequest(Request request, Context context) {
            System.out.println("Method = "+request.getHttpMethod());
            System.out.println("Headers= "+request.getHeaders().toString());
            System.out.println("Content= "+request.getContent().toString());
            System.out.println("Servcie Name = "+request.getServiceName().toString());
            System.out.println("Resource Path = "+request.getResourcePath().toString());
            return request.toString();
        }

    }

但是我收到了类似的错误

    {
      "errorMessage": "An error occurred during JSON parsing",
      "errorType": "java.lang.RuntimeException",
      "stackTrace": [],
      "cause": {
        "errorMessage": "com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of com.amazonaws.Request, problem: abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information\n at [Source: lambdainternal.util.NativeMemoryAsInputStream@4dfa3a9d; line: 1, column: 1]",
        "errorType": "java.io.UncheckedIOException",
        "stackTrace": [],
        "cause": {
          "errorMessage": "Can not construct instance of com.amazonaws.Request, problem: abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information\n at [Source: lambdainternal.util.NativeMemoryAsInputStream@4dfa3a9d; line: 1, column: 1]",
          "errorType": "com.fasterxml.jackson.databind.JsonMappingException",
          "stackTrace": [
            "com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)",
            "com.fasterxml.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:889)",
            "com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserialize(AbstractDeserializer.java:139)",
            "com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1511)",
            "com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1102)"
          ]
        }
      }
    }

我也尝试过使用不同的参数来代替Request，例如事件，但它们都不起作用。

Answer 1

您的有效负载映射模板有问题。在 API 网关设置期间，您可以指定如何将请求映射到事件。还有一些预制模板可供您选择。

看看亚马逊的这份文档:

API Gateway API Request and Response Payload-Mapping Template Reference

如果您需要更多帮助，请告诉我。