AWS API Gateway Lambda Error Regex

Question

I have Lambda function written in Python 2.7 which is triggered from API Gateway,

I want API Gateway to return 400 code when Lambda fails and I don't want to use Lambda Proxy so I'm trying to set API Gateway Integration Response.

When Lambda function fails it returns:

{
    "stackTrace": [
        [
            "/var/task/lambda_function.py",
            12,
            "lambda_handler",
            "raise Exception('failure')"
        ]
    ],
    "errorType": "Exception",
    "errorMessage": "failure"
}

Lambda Error Regex and Body Mapping template:

..the same from CLI:

aws apigateway get-integration-response --rest-api-id bz47krygwa --resource-id 788q0w --http-method ANY --status-code 400 --region us-west-1
{
    "statusCode": "400",
    "selectionPattern": ".*\"failure\".*",
    "responseTemplates": {
        "application/json": "#set($inputRoot = $input.path('$.errorMessage'))\n$inputRoot"
    }
}

..but it doesn't work correctly and still returns 200 code:

any advice on fix please?

kagarlickij · Accepted Answer · 2018-05-03 11:54:49Z

6

Answer turned out to be very simple - removing double quotes from Lambda Error Regex did the trick,

moreover Body Mapping template could also be removed:

..and it works as expected:

answered May 3, 2018 at 11:54

kagarlickij

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1 Comment

Rony Tesler Mar 27 at 19:10

Is there a way to mach the statusCode field returned from the lambda and not having to have an errorMessage field?

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