API Gateway/Cloudfront redirects folder access from express app which will return the index.html

Question

I have a serverless app running fine on API Gateway and CloudFront using express. The problem occurs when accessing a folder with an index.html file - it gets redirected to itself in a loop.

Main app working fine here:
https://d2x40omue01gmu.cloudfront.net/

Click on blog link in header and it should eventually go to:
https://d2x40omue01gmu.cloudfront.net/blog/

But it gets redirected back to itself. This is a CloudFront for an API Gateway endpoint

The express app handles GET on `/blog*` by returning `express.static(browserFolder, { maxAge: '1m' }))`

This works fine locally and on Firebase serverless:
https://www.findrvparks.com/blog/

Any help appreciated

Accepted Answer

Turns out that running the express app on API Gateway in a subfolder means I have to add the /prod prefix to the express get handler as `/prod/blog*`

Answer

Your API Gateway is returning 301 redirects on requests for /blog to /blog/

Requests for /blog/ result in a 403 which I believe is the correct behavior. However, this isn't the case for (eg) /maps - that just returns a 403 immediately, not a redirect to /maps/

I think the problem is that CloudFront has cached the 301 response for /blog and is serving it for subsequent requests for /blog/

To solve this, the best option would be to remove the direct from /blog to /blog/ if possible. Once you've done that, you'll need to invalidate /blog in the CloudFront cache.

API Gateway/Cloudfront redirects folder access from express app which will return the index.html

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