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Clarify limitations of SRV delegation in documentation (#14959)

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This PR just clarifies in the SRV DNS delegation document that there are
still cases a user may have to serve files from `.well-known` endpoints,
and this may not be a valid case for using SRV delegation. This has
caused some confusion in a few cases.

Signed-off-by: William Kray <github@williamkray.com>
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changelog.d/14959.doc Normal file
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Update delegation documentation to clarify that SRV DNS delegation does not eliminate all needs to serve files from .well-known locations. Contributed by @williamkray.

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docs/delegate.md
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@ -73,6 +73,15 @@ It is also possible to do delegation using a SRV DNS record. However, that is ge
not recommended, as it can be difficult to configure the TLS certificates correctly in
this case, and it offers little advantage over `.well-known` delegation.
Please keep in mind that server delegation is a function of server-server communication,
and as such using SRV DNS records will not cover use cases involving client-server comms.
This means setting global client settings (such as a Jitsi endpoint, or disabling
creating new rooms as encrypted by default, etc) will still require that you serve a file
from the `https://<server_name>/.well-known/` endpoints defined in the spec! If you are
considering using SRV DNS delegation to avoid serving files from this endpoint, consider
the impact that you will not be able to change those client-based default values globally,
and will be relegated to the featureset of the configuration of each individual client.
However, if you really need it, you can find some documentation on what such a
record should look like and how Synapse will use it in [the Matrix
specification](https://matrix.org/docs/spec/server_server/latest#resolving-server-names).