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-rw-r--r--synapse/http/server.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/http/server.py b/synapse/http/server.py
index 8c96f2196e..4b4debc5cd 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -344,7 +344,9 @@ class _AsyncResource(resource.Resource, metaclass=abc.ABCMeta):
 
     def render(self, request: SynapseRequest) -> int:
         """This gets called by twisted every time someone sends us a request."""
-        defer.ensureDeferred(self._async_render_wrapper(request))
+        request.render_deferred = defer.ensureDeferred(
+            self._async_render_wrapper(request)
+        )
         return NOT_DONE_YET
 
     @wrap_async_request_handler