从 API 网关调用时，Cloudwatch Logs PutLogEvents 操作失败，并出现 com.amazon.coral.service#UnknownOperationException

我使用 API Gateway 的 AWS 服务集成类型通过 PutLogEvents 操作将日志添加到 Cloudwatch Logs 服务，如下所述：https://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/API_PutLogEvents.html

我已经成功设置了一种类似类型的方法，使用 PutItem 操作将项目添加到 DynamoDB 表中，并且效果很好，所以我不确定这个方法缺少什么。

我已经仔细检查了我的模板是否存在拼写错误和问题。已使用 CLI 工具成功使用 PutLogEvents，因此设置似乎一切正常。

以下是我在 AWS dash 中设置的一些屏幕截图：

这是我正在使用的映射模板：

{
  "logGroupName": "FromAPI",
  "logStreamName": "$input.path('$.streamName')",
  "logEvents": [
    {
      "timestamp": $input.path('$.ts'), 
      "message": "$input.path('$.message')"
    }
  ]
}

我收到的响应有一个 200 状态代码，但响应正文如下：

{
  "Output": {
    "__type": "com.amazon.coral.service#UnknownOperationException",
    "message": null
  },
  "Version": "1.0"
}

这是经过编辑的 (xxx) 执行日志：

Execution log for request xxx
Fri Apr 19 02:28:58 UTC 2019 : Starting execution for request: xxx
Fri Apr 19 02:28:58 UTC 2019 : HTTP Method: POST, Resource Path: /log
Fri Apr 19 02:28:58 UTC 2019 : Method request path: {}
Fri Apr 19 02:28:58 UTC 2019 : Method request query string: {}
Fri Apr 19 02:28:58 UTC 2019 : Method request headers: {}
Fri Apr 19 02:28:58 UTC 2019 : Method request body before transformations: {
    "streamName": "12345",
    "ts": 1555641510000,
    "message": "help!"
}
Fri Apr 19 02:28:58 UTC 2019 : Endpoint request URI: https://logs.xxx.amazonaws.com/?Action=PutLogEvents
Fri Apr 19 02:28:58 UTC 2019 : Endpoint request headers: {Authorization=xxx, X-Amz-Date=20190419T022858Z, x-amzn-apigateway-api-id=xxx, Accept=application/json, User-Agent=AmazonAPIGateway_xxx, X-Amz-Security-Token=xxx [TRUNCATED]
Fri Apr 19 02:28:58 UTC 2019 : Endpoint request body after transformations: {
  "logGroupName": "FromAPI",
  "logStreamName": "12345",
  "logEvents": [
    {
      "timestamp": 1555641510000, 
      "message": "help!"
    }
  ]
}
Fri Apr 19 02:28:58 UTC 2019 : Sending request to https://logs.xxx.amazonaws.com/?Action=PutLogEvents
Fri Apr 19 02:28:58 UTC 2019 : Received response. Status: 200, Integration latency: 38 ms
Fri Apr 19 02:28:58 UTC 2019 : Endpoint response headers: {x-amzn-RequestId=xxx, Content-Type=application/json, Content-Length=105, Date=Fri, 19 Apr 2019 02:28:58 GMT}
Fri Apr 19 02:28:58 UTC 2019 : Endpoint response body before transformations: {"Output":{"__type":"com.amazon.coral.service#UnknownOperationException","message":null},"Version":"1.0"}
Fri Apr 19 02:28:58 UTC 2019 : Method response body after transformations: {"Output":{"__type":"com.amazon.coral.service#UnknownOperationException","message":null},"Version":"1.0"}
Fri Apr 19 02:28:58 UTC 2019 : Method response headers: {X-Amzn-Trace-Id=Root=xxx, Content-Type=application/json}
Fri Apr 19 02:28:58 UTC 2019 : Successfully completed execution
Fri Apr 19 02:28:58 UTC 2019 : Method completed with status: 200

没有任何内容记录到我的 Cloudwatch Logs 流中 - API Gateway 集成请求响应正文包含 UnknownOperationException 错误。

我最好的猜测是，由于某种原因，此请求未映射到 PutLogEvents 操作。奇怪的是，在这种情况下状态码是 200。

我猜这只是一些拼写错误 - 或者我需要发送的附加标头？有任何想法吗？

如果您在映射模板顶部添加以下几行，它应该可以工作：

#set($context.requestOverride.header['X-Amz-Target'] = "Logs_20140328.PutLogEvents")
#set($context.requestOverride.header['Content-Type'] = "application/x-amz-json-1.1")

这非常棘手并且没有很好的记录。您可以在以下位置找到这些标头PutLogEvents 的示例请求.