Return Count from Lambda into the "Response Header" of the API
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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?
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asked 6 years ago1.9K views
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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.
