index.html files not being returned on anything that isn't the home page on static site

Question

Hi all. So I sort of convinced myself to set up my static site in a more secure way. It's causing some headache.

**Basic setup**

I'm using an S3 bucket with Cloudfront in front with a certificate and am also using Route 53.

**Changes from my normal setup**

* Static website hosting is turned off on the bucket
* Block all public access is *On*
* Bucket policy is only allowing my cloudfront distribution to fetch the objects

**Distribution settings** (that may be relevant)

* Origin access control settings is turned on
* Origin access control has the appropriate OAC attached
* Alternate domain names is set to my domain (this fixes a 403 error)
* Default root object is set to index.html (this causes the root domain to return this file without showing the index.html in the url, however it doesn't work for any other locations like /about/)

Is something [like this](https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/example-function-add-index.html) necessary or is there something simpler I can do to cause the proper redirects?
My main concerns is to not add any additional latency or impact the performance of the site.

Let me know if you need more info. Thanks.

Accepted Answer

Hello.

CloudFront uses the requested URL to access your origin.  
In other words, in this case, the access is "s3-domain/about/" and if this continues, "index.html" will not be loaded.  
You should see that if you request "/about/index.html" it will be loaded.  
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/distribution-web-values-specify.html#DownloadDistValuesOriginPath  
> If you want CloudFront to request your content from a directory in your origin, enter the directory path, beginning with a slash (/). CloudFront appends the directory path to the value of Origin domain, for example, cf-origin.example.com/production/images. Do not add a slash (/) at the end of the path.

So, in order for "index.html" to be loaded when accessed with "/about/", you need to rewrite the URL using CloudFront Functions etc. as shown in the document you shared.  
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/example-function-add-index.html

As far as I can see from this AWS blog, it doesn't seem to have a big impact on performance.  
https://aws.amazon.com/jp/blogs/aws/introducing-cloudfront-functions-run-your-code-at-the-edge-with-low-latency-at-any-scale/

index.html files not being returned on anything that isn't the home page on static site

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