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Don't set connection close headers when they are already set on the Response #171

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Don't set connection close headers when they are already set on the Response #171

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Don't set connection close headers when they are already set on the R…
Kludex Mar 2, 2024
a76b5b1
Fix linter
Kludex Mar 3, 2024
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5 changes: 3 additions & 2 deletions h11/_connection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -648,8 +648,9 @@ def _clean_up_response_headers_for_sending(self, response: Response) -> Response
# Make sure Connection: close is set
connection = set(get_comma_header(headers, b"connection"))
connection.discard(b"keep-alive")
connection.add(b"close")
headers = set_comma_header(headers, b"connection", sorted(connection))
if b"close" not in connection:
connection.add(b"close")
headers = set_comma_header(headers, b"connection", sorted(connection))

return Response(
headers=headers,
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6 changes: 6 additions & 0 deletions h11/tests/test_connection.py
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Expand Up @@ -1118,3 +1118,9 @@ def test_special_exceptions_for_lost_connection_in_message_body() -> None:
with pytest.raises(RemoteProtocolError) as excinfo:
c.next_event()
assert "incomplete chunked read" in str(excinfo.value)


def test_ensure_connection_close_remains_untouched() -> None:
c = Connection(SERVER)
data = c.send(Response(status_code=200, headers=[(b"connection", b"close")]))
assert data == b"HTTP/1.1 200 \r\n" b"connection: close\r\n\r\n"