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-rw-r--r--synapse/http/client.py7
1 files changed, 6 insertions, 1 deletions
diff --git a/synapse/http/client.py b/synapse/http/client.py
index 09ea93e10d..ca2cdbc6e2 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -1037,7 +1037,12 @@ class _ReadBodyWithMaxSizeProtocol(protocol.Protocol):
         if reason.check(ResponseDone):
             self.deferred.callback(self.length)
         elif reason.check(PotentialDataLoss):
-            # stolen from https://github.com/twisted/treq/pull/49/files
+            # This applies to requests which don't set `Content-Length` or a
+            # `Transfer-Encoding` in the response because in this case the end of the
+            # response is indicated by the connection being closed, an event which may
+            # also be due to a transient network problem or other error. But since this
+            # behavior is expected of some servers (like YouTube), let's ignore it.
+            # Stolen from https://github.com/twisted/treq/pull/49/files
             # http://twistedmatrix.com/trac/ticket/4840
             self.deferred.callback(self.length)
         else: