How do I fix this 403 when redirecting www traffic to non-www?

Question

I have an S3 website with route-53 and cloudfront. I'm really happy with it.

I've edited the default cloudfront behaviour to redirect http to https and has a function on Viewer Request that rewrites - this looks fine when testing it in the web UI.

however, whenever I go to www. in a browser I get a 403 (either http or https)

It's doing my head in!

Riku_Kobayashi · Accepted Answer

Hello.

Are you configuring domains with and without "www" in the settings in the CloudFront document below?  
I think that if this was not set, an error would occur when accessing with a domain without "www".  
Try verifying that the alternate domain is configured successfully.  
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/CreatingCNAME.html  
https://repost.aws/knowledge-center/cloudfront-troubleshoot-403-errors

How do I fix this 403 when redirecting www traffic to non-www?

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