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https://twitter.com breaks the proxy. It does a 302 redirect to itself. Visiting in a browser doesn't have a redirect loop somehow, but fetching from the server side does.
https://rviscomi.github.io/capo.js/user/demo/?url=https%3A%2F%2Ftwitter.com
The client script will happily attempt to parse the empty response, so this fix immediately throws an error for the special HTTP 502 in response to this edge case as well as any other unexpected errors.