Javascript 访问Lambda REST时Lambda代理响应格式错误

我使用

Javascript

创建简单的函数，该函数将部署在awslambda上并用作REST

它应该生成随机名称，但现在我使用硬编码值

// NamingService.js
class NamingService {
    generateName() {
        return 'generated-name'
    }
}

module.exports = NamingService;

在这个文件中，我处理请求

const NamingService = require('./NamingService');

const responses = {
    success: (data={}) => {
        return {
            "statusCode": 200,
            "headers": {
                "Access-Control-Allow-Origin" : "*",
                "Access-Control-Allow-Credentials" : true
            },
            "body": JSON.stringify(data)
        }
    },
    error: (error) => {
        return {
            "statusCode": error.code || 500,
            "headers": {
                "Access-Control-Allow-Origin" : "*",
                "Access-Control-Allow-Credentials" : true
            },
            "body": JSON.stringify(error)
        }
    }
};

module.exports = {
    generateName: (event, context, callback) => {
        context.callbackWaitsForEmptyEventLoop = false;
        const namingService = new NamingService();
        namingService.generateName()
            .then(name => {
                callback(null, responses.success(name))
            })
            .catch(error => {
                callback(null, responses.error(error))
            })
    }
};

我使用

serverless

部署lambda函数

service: naming-service

provider:
  name: aws
  runtime: nodejs8.10
  region: eu-west-1
  memorySize: 128
  timeout: 30

functions:
  generateName:
    handler: lambdaHandlers.generateName
    events:
      - http:
          path: jester/name/generate
          method: get
          cors:
            origins:
              - '*'

在

serverless deploy

之后，它会显示响应

region: eu-west-1
stack: naming-service-dev
api keys:
  None
endpoints:
  GET - https://endpoint/jester/name/generate
functions:
  generateName: naming-service-dev-generateName

但当我尝试运行它（使用API网关上的测试）时，我得到了这个错误

Fri May 11 21:37:19 UTC 2018 : Endpoint response body before transformations: "generated-name"
Fri May 11 21:37:19 UTC 2018 : Endpoint response headers: {Content-Length=16, Date=Fri, 11 May 2018 21:37:19 GMT;sampled=0, Content-Type=application/json}
Fri May 11 21:37:19 UTC 2018 : Execution failed due to configuration error: Malformed Lambda proxy response
Fri May 11 21:37:19 UTC 2018 : Method completed with status: 502

---

问题是什么？

问题在于

generateName

处理程序。我不应该在方法

generateName

generateName: (event, context, callback) => {
    context.callbackWaitsForEmptyEventLoop = false;
    const namingService = new NamingService();
    const generatedName = namingService.generateName();
    callback(null, responses.success(generatedName));
}

---

可疑：标题值是字符串，因此您的布尔值

true

似乎与类型不匹配。我建议使用一个字符串值，

“访问控制允许凭据”：“true”

@Michael sqlbot它似乎找不到

namingService.generateName（…）。然后在执行期间（查看日志）