How to understand why CloudFront returns 301?

Question

I posted it earlier here, but didn't receive a response: https://stackoverflow.com/questions/75640175/how-to-understand-why-cloudfront-returns-301

I have a distribution in CloudFront pointing to a custom origin. It worked just fine for more than five years and just a few weeks ago started to return 301 for all requests. The origin works as before, SSL certificates are valid both at the CloudFront endpoint and at the origin. The configuration of the "behavior" I didn't change in CloudFront. What could be the problem and how can I understand where is it?

If it helps, here is the URL: https://djk1be5eatcae.cloudfront.net/?u=https://www.yegor256.com/index.html. The origin that it points to is relay.jare.io. Thus, the URL to be used to fetch the content is this: https://relay.jare.io/?u=https://www.yegor256.com/index.html (works for me). All information is public, no sensitive information is revealed.

Answer

There was a problem with the version of TLS/SSL. I set it to SSLv3 and now it works.

Answer

https://djk1be5eatcae.cloudfront.net/?u=https://www.yegor256.com/index.html for me returns:
```
Please, submit this stacktrace to GitHub and we'll try to help: https://github.com/yegor256/jare/issues

java.lang.IllegalStateException: [GET https://relay.jare.io/] failed in 0ms: [400] Parameter "u" is mandatory in https://relay.jare.io/
...
```
as if I hadn't passed "?u=...".  Have you set a cache policy on your CF distribution that excludes this or all query string params from the cache & being sent to the origin? https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/controlling-the-cache-key.html

How to understand why CloudFront returns 301?

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