Http-Api

CORS on AWS API Gateway HTTP APIs looks simple right up until your browser starts throwing No 'Access-Control-Allow-Origin' header and your backend logs show everything is “working fine.” I’ve hit this enough times that I now treat CORS as part browser contract, part API Gateway feature, and part trap. This guide is about API Gateway HTTP APIs specifically, not the older REST API product. The behavior is different enough that mixing them up causes bad advice and wasted hours. ...

CORS on API Gateway looks easy until the browser starts throwing vague errors and Terraform happily deploys a broken setup. I’ve hit this enough times that I now treat CORS as a first-class part of the API contract, not a checkbox. If you manage AWS API Gateway with Terraform, the main thing to remember is this: CORS is enforced by browsers, but you implement it in API Gateway and your backend responses. ...