the redirection to phoenix from nginx loses the authorization header

This is a feature in curl. If a request gets redirected to a different hostname, then any Authorization header is going to be removed in the second request in order not to leak credentials to an unrelated server. (You’re making a request to localhost:80, but the redirect location is, so that counts as a different hostname.)

You can get curl to forward the Authorization header by using the --location-trusted option instead of -L.

(Though it’s odd that you’re seeing this with curl 7.54.0 – according to this security advisory, curl 7.54.0 should behave as you expect it to, and only 7.58.0 and higher have this protection feature.)

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