CORS for Terraform API Gateway: Copy-Paste Reference

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. ...

April 21, 2026 · 6 min · headertest.com