AWS lambda 函数在参数中具有“事件”和“上下文”。“事件”是一个 json 对象。

我尝试将 API（通过 AWS API 网关的管理器）连接到我的 lambda 函数，将事件的 json 作为 http POST 的正文发送。这很失败，我只是有一些迹象表明可能有一个空事件发送到 lambda 函数。

我应该如何通过 API 发送“事件”？

这是我的 lambda 函数的代码：

from __future__ import print_function

import boto3
import json
import time

print('Loading function')

def lambda_handler(event, context):
    print("Received event: ")
    print(type(event))
    print(""+json.dumps(event, indent=2))

    id = event['Id']
    dynamo = boto3.resource('dynamodb').Table('Table1')
    dynamo.put_item( 
        Item = {
        'Button' : int(id),
        'Time' : int(time.time()),
    })
    return {
        'statusCode' : '400',
        'body' : null,
        'headers' : { 'Content-Type': 'application/json', },
    }

对 lambda 函数运行测试会得到以下日志：

START RequestId: x Version: $LATEST
Received event: 
<type 'dict'>
{
  "Id": "1"
}
END RequestId: x

和答案

{
   "body": null,
   "headers": {
     "Content-Type": "application/json"
  },
  "statusCode": "400"
}

但是通过 API Gateway 测试功能运行它会给出

Tue May 16 15:54:27 UTC 2017 : Endpoint response body before transformations: 
  {"stackTrace": [["/var/task/lambda_function.py", 12, "lambda_handler", 
   "id = event['Id']"]], "errorType": "KeyError", "errorMessage": "'Id'"}
Tue May 16 15:54:27 UTC 2017 : Endpoint response headers: 
  {x-amzn-Remapped-Content-Length=0, x-amzn-RequestId=x, 
   Connection=keep-alive, Content-Length=153,
   X-Amz-Function-Error=Unhandled, Date=Tue, 16 May 2017 15:54:27 GMT, 
   X-Amzn-Trace-Id=root=x;sampled=0, Content-Type=application/json}
Tue May 16 15:54:27 UTC 2017 : Execution failed due to configuration 
   error: Malformed Lambda proxy response
Tue May 16 15:54:27 UTC 2017 : Method completed with status: 502