CORS for SendGrid Webhooks: A Real-World Fix
If you’re debugging “CORS errors with SendGrid webhooks,” there’s a decent chance you’re solving the wrong problem. I’ve seen teams burn hours tweaking Access-Control-Allow-Origin on webhook endpoints that were never meant to be called by a browser in the first place. SendGrid webhooks are server-to-server callbacks. CORS is a browser enforcement layer. Those are two very different worlds. The real mess usually starts when someone tries to involve frontend JavaScript in webhook flows. ...