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Return Count from Lambda into the "Response Header" of the API


A customer is using API Gateway to return information via Lambda. However, they would like to put a count from Lambda into the "Response Header" of the API, which is returned to the requester, instead of in the body of the response.

In API Gateway how can I take the response from Lambda and map the "count" field into the header of the HTTP response?

1 Answers
Accepted Answer

If you return the count in a header from the Lambda function you can just reference it using integration.response.header.header-name.

To return a header from the Lambda function just return something like this:

    "statusCode": 200,
    "headers": {
        "header1Name": "header1Value",
        "header2Name": "header2Value",
    "body": "...",

For more information see here. You will see that it describes that only headers from the backend can be mapped to headers in the response.

answered 2 years ago

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