MSC2499 integration: make self-check of /.well-known/matrix/client accept redirects

[aine-etke]

Rationale: the /.well-known/matrix/server should return only 200 as well, but it has hardcoded "safe" value, regardless the spec: https://spec.matrix.org/v1.4/client-server-api/#well-known-uri

So, why not do the same for the /.well-known/matrix/client?

[spantaleev]

For /.well-known/matrix/server we don't have a variable and hardcode safe here:

matrix-docker-ansible-deploy/roles/matrix-nginx-proxy/tasks/self_check_well_known.yml

Line 19 in 21eabf4

follow_redirects: safe

It's because the Server-Server spec about well-known says:

30x redirects should be followed, however redirection loops should be avoided.

So, the playbook is following the spec for both /.well-known/matrix/server (redirects allowed, so we allow them) and /.well-known/matrix/client (redirects are not allowed according to the spec, so we don't allow them).

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The question is.. if everyone is allowing redirects in practice, should we disregard the spec and just allow it too?

Or maybe bring this into discussion with the Matrix folks who would:

• either bring it into the spec (because it makes sense and because it's somewhat common usage already)
• or fix the Element bug which allows this against-spec behavior

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I think your PR title and PR description are incorrect, mentioning server where it should say client and vice-versa.

[aaronraimist]

either bring it into the spec (because it makes sense and because it's somewhat common usage already)

The relevant MSC is matrix-org/matrix-spec-proposals#2499

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