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-rw-r--r--synapse/rest/client/v1/room.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index cf478c6f79..644aa4e513 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -232,7 +232,10 @@ class JoinRoomAliasServlet(ClientV1RestServlet):
 
         if RoomID.is_valid(room_identifier):
             room_id = room_identifier
-            remote_room_hosts = None
+            try:
+                remote_room_hosts = request.args["server_name"]
+            except:
+                remote_room_hosts = None
         elif RoomAlias.is_valid(room_identifier):
             handler = self.handlers.room_member_handler
             room_alias = RoomAlias.from_string(room_identifier)