Set Content-Length for BinaryResult

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/python/web_support.py b/lib/python/web_support.py
index 6f76f5c3c3..da68b7d315 100644
--- a/lib/python/web_support.py
+++ b/lib/python/web_support.py
@@ -674,6 +674,7 @@ class BinaryResult(Result):
         self.contents = contents
         self.status = status
         self.headers['Content-Type'] = mimetype
+        self.headers['Content-Length'] = str(len(self.contents))
 
     def flatten(self, write):
         """Invokes write for the response header and the binary data."""