Question

我正在对lambda服务进行REST调用，并获得包含一些预期数据以及响应标头信息的响应。我正在尝试访问客户端的标头键值之一，但是当我在javascript中读取标头信息时，我只会得到内容类型。在浏览器开发人员的“网络”标签中，我可以看到标题键值集。我试图在lambda的Cloudformation模板中为该特定密钥添加Access-Control-Expose-Headers，但是在将其部署到AWS时却遇到另一个异常。不知道我在想什么。任何帮助将非常感激。谢谢。

Answer 1

请确保您在API网关的路径中具有options方法：

Api:
  Type: AWS::ApiGateway::RestApi
  Properties:
    Name: "my-api"
    Body:
      swagger: "2.0"
      info:
        version: "2018-03-20T13:41:34Z"
      basePath: "/"
      schemes:
      - "https"
      paths:
        /my-path:
          options:
            responses:
              "200":
                headers:
                  Access-Control-Allow-Origin:
                    type: "string"
                  Access-Control-Allow-Methods:
                    type: "string"
                  Access-Control-Allow-Headers:
                    type: "string"
            x-amazon-apigateway-integration:
              responses:
                default:
                  statusCode: "200"
                  responseParameters:
                    method.response.header.Access-Control-Allow-Methods: "'GET,POST,PUT,DELETE,OPTIONS'"
                    method.response.header.Access-Control-Allow-Headers: "'Content-Type,X-Amz-Date,Authorization,x-api-key,x-amz-security-token,Auth'"
                    method.response.header.Access-Control-Allow-Origin: "'*'"
              requestTemplates:
                application/json: "{\"statusCode\":200}"
              passthroughBehavior: when_no_match
              type: mock
          post:
          ...

您可以通过Lambda设置标题，如下所示：

exports.handler = async event => {
    ...    
    return {
        isBase64Encoded: false,
        statusCode: 200,
        headers: {                             
            'Access-Control-Expose-Headers': 'Content-Type,...',
            'Access-Control-Allow-Origin': '*',
            'Content-Type': 'application/json'
        },
        body: JSON.stringify(data)
    }
}

在AWS Lambda响应标头中添加Access-Control-Expose-Headers

1 个答案: