Add deprecation warnings for `webclient` listener and non-HTTP(S) `web_client_location`. (#11774)

This changes the behaviour of the root endpoint to redirect
directly to the configuration of `web_client_location` if it is
given an HTTP(S) URL.

1 files changed, 11 insertions, 0 deletions

diff --git a/docs/upgrade.md b/docs/upgrade.md

index 30bb0dcd9c..f455d257ba 100644
--- a/docs/upgrade.md
+++ b/docs/upgrade.md
@@ -85,6 +85,17 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# Upgrading to v1.51.0
+
+## Deprecation of `webclient` listeners and non-HTTP(S) `web_client_location`
+
+Listeners of type  `webclient` are deprecated and scheduled to be removed in
+Synapse v1.53.0.
+
+Similarly, a non-HTTP(S) `web_client_location` configuration is deprecated and
+will become a configuration error in Synapse v1.53.0.
+
+
 # Upgrading to v1.50.0
 
 ## Dropping support for old Python and Postgres versions