521 errors on proxied connections

Website, Application, Performance
1

What is the name of the domain?

zotero.retorque.re

What is the error number?

521

What is the issue you’re encountering

I’m getting 521 errors. The site being proxied is reachable. SSL mode is Full

What steps have you taken to resolve the issue?

Tested direct URL, verified SSL status.

What are the steps to reproduce the issue?

curl http://zotero.retorque.re/file/apt-package-archive/./InRelease

vs

curl https://f001.backblazeb2.com/file/apt-package-archive/./InRelease

2

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