Shouldn't the /oauth/jwks endpoint be accessible without authentication?

I'm in the process of trying to use Drupal + Simple_Oauth as the single sign on server for Synapse / Matrix.

When I set up the configuration for OpenID Connect in Synapse homeserver.yaml file, it was getting a 403 forbidden error when it tried to connect to the /oauth/jwks endpoint.

Just to document my solution I retrieved my public.key value from Simple_Oauth module

Then I used this this converter tool:
https://russelldavies.github.io/jwk-creator/

And created /.well-known/jwks file by hand

That allowed Synapse to start up with the homeserver.yaml settings intact - yay!

However, when I tried to use app.element.io to log in using Drupal, Synapse was giving this "not canonical" error:

2023-01-26 17:36:53,521 - synapse.rest.client.login - 621 - INFO - GET-80 - Requested URI https://matrix.covingtoncreations.net/_matrix/client/r0/login/sso/redirect/oidc-drupal?redirectUrl=https%3A%2F%2Fapp.element.io%2F is not canonical: redirecting to https://covingtoncreations.net/_matrix/client/r0/login/sso/redirect/oidc-drupal?redirectUrl=https%3A%2F%2Fapp.element.io%2F
2023-01-26 17:36:53,522 - synapse.access.http.8008 - 460 - INFO - GET-80 - 10.0.0.1 - 8008 - {None} Processed request: 0.002sec/-0.001sec (0.000sec, 0.000sec) (0.000sec/0.000sec/0) 0B 302 "GET /_matrix/client/r0/login/sso/redirect/oidc-drupal?redirectUrl=https%3A%2F%2Fapp.element.io%2F HTTP/1.1" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/109.0" [0 dbevts]

It's trying to get back to matrix.example.com but for some reason it's passing it over to example.com, the matrix server isn't able to actually process the remainder.

I realize this will be fixed in the other issue, but I wanted to upload a 6.x compatible patch file.