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Updated docs: Added note about missing 308 redirect support. (#8120) 

* Updated docs: Added note about missing 308 redirect support.

* Added changelog
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Ryan Cole 2020-08-19 23:26:50 +12:00 committed by GitHub
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Updated documentation to note that Synapse does not follow `HTTP 308` redirects due to an upstream library not supporting them. Contributed by Ryan Cole.

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docs/federate.md
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@ -47,6 +47,18 @@ you invite them to. This can be caused by an incorrectly-configured reverse
proxy: see [reverse_proxy.md](<reverse_proxy.md>) for instructions on how to correctly
configure a reverse proxy.
### Known issues
**HTTP `308 Permanent Redirect` redirects are not followed**: Due to missing features
in the HTTP library used by Synapse, 308 redirects are currently not followed by
federating servers, which can cause `M_UNKNOWN` or `401 Unauthorized` errors. This
may affect users who are redirecting apex-to-www (e.g. `example.com` -> `www.example.com`),
and especially users of the Kubernetes *Nginx Ingress* module, which uses 308 redirect
codes by default. For those Kubernetes users, [this Stackoverflow post](https://stackoverflow.com/a/52617528/5096871)
might be helpful. For other users, switching to a `301 Moved Permanently` code may be
an option. 308 redirect codes will be supported properly in a future
release of Synapse.
## Running a demo federation of Synapses
If you want to get up and running quickly with a trio of homeservers in a