amazon-web-services - 在本地运行AWS SAM CLI时启用CORS

Question

每当我尝试通过浏览器通过POST访问无服务器lambda函数时，都会收到错误消息

Response to preflight request doesn't pass access control check: No >'Access-Control-Allow-Origin' header is present on the requested resource.

当它是 /GET时，它可以正常工作，我已经读过它，因为它没有发送飞行前请求。当我将其更改为 POST时，这是失败的。

我正在运行的命令:
sam local start-api
我的template.yaml是:

...

Resources:
    PropertiesFunction:
        Type: AWS::Serverless::Function
        Properties:
            CodeUri: target/service-0.0.1-SNAPSHOT.jar
            Handler: com.aws.PropertiesHandler::handleRequest
            Runtime: java8
            Events:
                PropertiesApi:
                    Type: Api
                    Properties:
                        Path: /properties
                        Method: post

...

如何在这些端点上启用CORS？

Answer 1

我遇到了同样的错误，并且已经在3个步骤中对其进行了修复。 (Java8中的AWS Lambda，SAM CLI v0.37.0)

为标题添加选项:

    Map<String, String> headers = new HashMap<>();
    headers.put("Content-Type", "application/json");
    headers.put("X-Custom-Header", "application/json");
    headers.put("Access-Control-Allow-Origin", "*");
    headers.put("Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, PATCH, DELETE");
    headers.put("Access-Control-Allow-Headers", "X-Requested-With,content-type");

将Option Cors添加到template.yaml

    Globals:
      Function:
        Timeout: 20
      Api:
        Cors:
          AllowMethods: "'GET,POST,OPTIONS'"
          AllowHeaders: "'content-type'"
          AllowOrigin: "'*'"
          AllowCredentials: "'*'"

更新template.yaml中的属性资源功能

          Events:
            HelloWorld:
              Type: Api 
              Properties:
                # Path: /hello
                # Method: get
                Path: "/{proxy+}"
                Method: ANY