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-rw-r--r--synapse/handlers/cas_handler.py4
1 files changed, 1 insertions, 3 deletions
diff --git a/synapse/handlers/cas_handler.py b/synapse/handlers/cas_handler.py
index a4cc4b9a5a..048a3b3c0b 100644
--- a/synapse/handlers/cas_handler.py
+++ b/synapse/handlers/cas_handler.py
@@ -212,9 +212,7 @@ class CasHandler:
         else:
             if not registered_user_id:
                 # Pull out the user-agent and IP from the request.
-                user_agent = request.requestHeaders.getRawHeaders(
-                    b"User-Agent", default=[b""]
-                )[0].decode("ascii", "surrogateescape")
+                user_agent = request.get_user_agent("")
                 ip_address = self.hs.get_ip_from_request(request)
 
                 registered_user_id = await self._registration_handler.register_user(