Application Load Balancer return 405 method not allowed for OPTIONS verb

Question

My ALB points to my API in Fargate. Running my API locally it responds correctly.

All other end-points and http verbs appear to be working fine.

I don't see any settings anywhere that can impact http verbs with the ALB, target groups, etc.

Appreciate any advice
Thanks,
Jon

Accepted Answer

If you're using **ALB** to route traffic to your applications (for instance, containers running on ECS with Fargate or EC2 instances), you need to ensure that your application or the web server it's running on is configured to return the necessary **CORS headers** in response to preflight `OPTIONS` requests as well as other applicable requests.

Application Load Balancer return 405 method not allowed for OPTIONS verb

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