[Twisted-Python] self.channel.writeHeaders(version, code, reason, headers)\nbuiltins.AttributeError: \'NoneType\' object has no attribute \'writeHeaders\'\

[Glyph]

> On Aug 2, 2019, at 4:31 PM, Waqar Khan <wk80333 at gmail.com> wrote:
> 
> Hi,
>   I have a twisted server. And I have been seeing this annoying issue.
> Normally. when i develop and test it out. everything is fine..
> But then I try to loadtest is via https://locust.io/ <https://locust.io/>
> 
> Again, everything is fine.. until I "stop" the test.
> Then, I see this
> 'Traceback (most recent call last):\n  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/events.py", line 88, in _run\n    self._context.run(self._callback, *self._args)\n  File "/usr/local/lib/python3.7/site-packages/twisted/internet/defer.py", line 827, in adapt\n    adapt.actual.callback(extracted)\n  File "/usr/local/lib/python3.7/site-packages/twisted/internet/defer.py", line 460, in callback\n    self._startRunCallbacks(result)\n  File "/usr/local/lib/python3.7/site-packages/twisted/internet/defer.py", line 568, in _startRunCallbacks\n    self._runCallbacks()\n--- <exception caught here> ---\n  File "/usr/local/lib/python3.7/site-packages/twisted/internet/defer.py", line 654, in _runCallbacks\n    current.result = callback(current.result, *args, **kw)\n  File 
> ....
>  File "/usr/local/lib/python3.7/site-packages/twisted/web/server.py", line 238, in write\n    http.Request.write(self, data)\n  File "/usr/local/lib/python3.7/site-packages/twisted/web/http.py", line 1118, in write\n    self.channel.writeHeaders(version, code, reason, headers)\nbuiltins.AttributeError: \'NoneType\' object has no attribute \'writeHeaders\'\n'
> 
> 
> I found this similar bug report: https://github.com/buildbot/buildbot/issues/4045 <https://github.com/buildbot/buildbot/issues/4045>
> But I am using 19.2.1 twisted version..

There is a prerelease version, with this bug fixed, that is awaiting final release upload right now; can you try with Twisted==19.7.0rc1 ?  That should fix this issue.  If not, then we have some investigating to do :-).

-g

-g
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