node.js - 如何从 ApiGateway 缓存资源获取内容编码

Question

我们有一个返回 gzip 编码的端点。我们想要缓存该值，我们正在使用 ApiGateway 来为我们做到这一点。资源方法定义如下，

GetManifestApiGatewayMethod: # very good
      Type: "AWS::ApiGateway::Method"
      Properties:
        AuthorizationType: "NONE"
        HttpMethod: "GET"
        ResourceId:
          Ref: ManifestConfigurationResource
        RestApiId:
          Ref: ApiGatewayRestApi
        RequestParameters:
          method.request.path.seasonCode: true
          method.request.path.facilityCode: true
          method.request.path.configurationCode: true
          method.request.querystring.policyCode: true
          method.request.header.PAC-Authorization: true
          method.request.header.PAC-Application-ID: true
          method.request.header.PAC-API-Key: true
          method.request.header.PAC-Channel-Code: true
          method.request.header.PAC-Organization-ID: true
          method.request.header.PAC-Developer-ID: true
          method.request.header.PAC-Request-ID: false
          method.request.header.Accept-Encoding: true
        MethodResponses:
          - StatusCode: 200
            # ResponseParameters:
            #   method.response.header.Content-Encoding: true
        Integration:
          IntegrationHttpMethod: GET
          Type: HTTP
          Uri: https://${self:provider.environment.PDI_HOST}/pdi/v1/manifest/{seasonCode}/{facilityCode}/{configurationCode}
          PassthroughBehavior: WHEN_NO_MATCH
          CacheKeyParameters:
            - method.request.path.seasonCode
            - method.request.path.facilityCode
            - method.request.path.configurationCode
            - method.request.querystring.policyCode
          IntegrationResponses:
            - StatusCode: 200
              SelectionPattern: '\d\d\d'
              # ResponseParameters:
              #   method.response.header.content-encoding: integration.response.body.headers.content-encoding
          RequestParameters:
            integration.request.path.seasonCode: method.request.path.seasonCode
            integration.request.path.facilityCode: method.request.path.facilityCode
            integration.request.path.configurationCode: method.request.path.configurationCode
            integration.request.querystring.policyCode: method.request.querystring.policyCode
            integration.request.header.Authorization: method.request.header.PAC-Authorization
            integration.request.header.PAC-Application-ID: method.request.header.PAC-Application-ID
            integration.request.header.PAC-API-Key: method.request.header.PAC-API-Key
            integration.request.header.PAC-Channel-Code: method.request.header.PAC-Channel-Code
            integration.request.header.PAC-Organization-ID: method.request.header.PAC-Organization-ID
            integration.request.header.PAC-Developer-ID: method.request.header.PAC-Developer-ID
            integration.request.header.PAC-Request-ID: method.request.header.PAC-Request-ID
            integration.request.header.Accept-Encoding: method.request.header.Accept-Encoding

http.get方法中有以下逻辑:

const 编码 = response.headers["内容编码"];
if (encoding && encoding.indexOf("gzip") >= 0) {...}//处理 gzip

但是当我们使用上面的集成方法时，我没有得到通常通过直接访问它代理的 api 获得的 header 。我尝试传递一些带注释的代码，但在使用这些响应映射时出现内部服务器错误。

Answer 1

从代码模板的外观来看，方法响应 header 看起来是正确的。

method.response.header.Content-Encoding: true

但是您的集成响应，ResponseParameters 似乎是错误的。

method.response.header.content-encoding: integration.response.body.headers.content-encoding

首先，属性Key应该完全匹配，因此大写可能会增加问题。然而，您的值(value)似乎才是真正的问题。根据AWS Documentation :

Use the destination as the key and the source as the value:

The destination must be an existing response parameter in theMethodResponse property.

The source must be an existing method request parameter or a staticvalue. You must enclose static values in single quotation marks andpre-encode these values based on the destination specified in therequest.

您似乎正在尝试将集成响应方法映射到该值，而不是方法请求参数。