AWS Lambda，API网关返回格式错误的Lambda代理响应502错误

经过大量的谷歌search和几个小时的试错，我找不到为什么我得到这个错误消息：

由于configuration错误，执行失败：Lambda代理响应格式错误

当我使用testinglambdafunction运行lambda时，它工作正常。 对这个状态的类似问题的答案，来自lambda的响应需要符合这种格式：

{ "isBase64Encoded": true|false, "statusCode": httpStatusCode, "headers": { "headerName": "headerValue", ... }, "body": "..." } 

下面是我使用的lambda（遵守这种格式）：

 'use strict'; var aws = require('aws-sdk'); var ses = new aws.SES(); var RECEIVER = "[e-mail]"; var SENDER = "[e-mail]"; const response_success = { 'isBase64Encoded': false, 'statusCode': 200, 'headers': { 'Content-Type': 'application/json', }, body: JSON.stringify({ message: 'ok' }), }; const response_error = { 'isBase64Encoded': false, 'statusCode': 400, 'headers': { 'Content-Type': 'application/json', }, body: JSON.stringify({ message: 'error' }), }; exports.handler = (event, context, callback) => { sendEmail(event, function(error, data) { if (error) { callback(response_error); } else { callback(null, response_success); } }); }; function sendEmail(event, done) { var params = { Destination: { ToAddresses: [ RECEIVER ] }, Message: { Body: { Text: { Data: event.message, Charset: 'UTF-8' } }, Subject: { Data: 'Lamda Test Email', Charset: 'UTF-8' } }, Source: SENDER } ses.sendEmail(params, done); } 

我不认为它的configuration问题，我使用Terraform来构build基础设施，如果这有什么帮助。 提前致谢！

编辑:(添加下面的错误日志）

 Execution log for request test-request Fri May 05 16:36:22 UTC 2017 : Starting execution for request: test-invoke-request Fri May 05 16:36:22 UTC 2017 : HTTP Method: POST, Resource Path: /messages Fri May 05 16:36:22 UTC 2017 : Method request path: {} Fri May 05 16:36:22 UTC 2017 : Method request query string: {} Fri May 05 16:36:22 UTC 2017 : Method request headers: {} Fri May 05 16:36:22 UTC 2017 : Method request body before transformations: { "message" : "test" } Fri May 05 16:36:22 UTC 2017 : Endpoint request URI: https://lambda.eu-west-1.amazonaws.com/2015-03-31/functions/arn:aws:lambda:eu-west-1:670603659598:function:mailer_lambda/invocations Fri May 05 16:36:22 UTC 2017 : Endpoint request headers: {x-amzn-lambda-integration-tag=test-request, Authorization=****************************************************************************************************************************************************************************************************************************************************************************************************************************************cd4bef, X-Amz-Date=20170505T163622Z, x-amzn-apigateway-api-id=jnnd4wh3f8, X-Amz-Source-Arn=arn:aws:execute-api:eu-west-1:670603659598:jnnd4wh3f8/null/POST/messages, Accept=application/json, User-Agent=AmazonAPIGateway_jnnd4wh3f8, X-Amz-Security-Token=FQoDYXdzEPH//////////wEaDB1y8s+RanRAP61EAyK3A1f/o2BrYfqUOQwsrn7bRF6OMmeD3Se+WVWA1reC3tZZ6+IfnFa0LVNnaaNM27o/Vqc/m4tnQR5xUACK3I6ssbkwHj9E4sM3sQ4L+zNQSnkZhMAIRxbyxHJRp1E9/8XnVxRJAWF5ynWCmDxe2tQQ8SXCnQKIKzJypIgp0E0BD3hZ92soW6wID64uaufk+qYXiV7AJxd+Z9Gg1TyiwacUA2i0g4xsjDqeAA5wFbI9KoiYK6/+uwpQ5mxdxg6JIxS7H9jULRRn7V9E4YVXsXCWXh8RXqGmigGzWXChYAD3S7b9rBLUpTga3t3SlnnK [TRUNCATED] Fri May 05 16:36:22 UTC 2017 : Endpoint request body after transformations: {"resource":"/messages","path":"/messages","httpMethod":"POST","headers":null,"queryStringParameters":null,"pathParameters":null,"stageVariables":null,"requestContext":{"accountId":"670603659598","resourceId":"90rzx3","stage":"test-invoke-stage","requestId":"test-invoke-request","identity":{"cognitoIdentityPoolId":null,"accountId":"670603659598","cognitoIdentityId":null,"caller":"670603659598","apiKey":"test-invoke-api-key","sourceIp":"test-invoke-source-ip","accessKey":"ASIAJA3SYDRPGE36PMXQ","cognitoAuthenticationType":null,"cognitoAuthenticationProvider":null,"userArn":"arn:aws:iam::670603659598:root","userAgent":"Apache-HttpClient/4.5.x (Java/1.8.0_112)","user":"670603659598"},"resourcePath":"/messages","httpMethod":"POST","apiId":"jnnd4wh3f8"},"body":"{ \"message\" : \"test\" }","isBase64Encoded":false} Fri May 05 16:36:22 UTC 2017 : Endpoint response body before transformations: {"errorMessage":"[object Object]"} Fri May 05 16:36:22 UTC 2017 : Endpoint response headers: {x-amzn-Remapped-Content-Length=0, x-amzn-RequestId=f91382de-31b0-11e7-bfaa-c7e2e3193355, Connection=keep-alive, Content-Length=34, X-Amz-Function-Error=Handled, Date=Fri, 05 May 2017 16:36:22 GMT, X-Amzn-Trace-Id=root=1-590caa06-47c0526e9aba46d52e47aee5;sampled=0, Content-Type=application/json} Fri May 05 16:36:22 UTC 2017 : Execution failed due to configuration error: Malformed Lambda proxy response Fri May 05 16:36:22 UTC 2017 : Method completed with status: 502 

Answer 1

感谢@johni和@UXDart的帮助。 问题是，API网关和lambda之间的集成请求正在转变请求主体（你可以在这里find更多关于这个）

所以我改变了处理程序来parsingevent.body，所以我现在可以从事件中访问正确的数据。 （NB在lambda中testing会导致函数超时，所以你需要从api-gateway进行testing）

这是我改变了：

 exports.handler = (event, context, callback) => { const body = JSON.parse(event.body); sendEmail(body, function(error, data) { if (error) { callback(null, response_error); } else { callback(null, response_success); } }); }; 

Answer 2

不完全确定，但是你应该只是返回一个结果，即使是一个错误，因为你正在使用状态码

所以改变callback（response_error）; callback（null，response_error）;