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In finish(), test if chunk is None rather than using truthiness to de…


whether to call write().

This fixes a discrepancy between finish() and write() when outputting json.
Now both write({}) and finish({}) will output an empty json object.
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1 parent 8637a73 commit 45f76c518eaf032c40fd39cc1384577742e5dd4d Ben Darnell committed Mar 7, 2010
Showing with 1 addition and 1 deletion.
  1. +1 −1 tornado/
2 tornado/
@@ -463,7 +463,7 @@ def flush(self, include_footers=False):
def finish(self, chunk=None):
"""Finishes this response, ending the HTTP request."""
assert not self._finished
- if chunk: self.write(chunk)
+ if chunk is not None: self.write(chunk)
# Automatically support ETags and add the Content-Length header if
# we have not flushed any content yet.

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