[Twisted-Python] Can't create ticket in Trac

[Glyph Lefkowitz]

> On Jan 27, 2017, at 3:53 PM, Jean-Paul Calderone <exarkun at twistedmatrix.com> wrote:
> 
> On Fri, Jan 27, 2017 at 6:52 PM, Glyph Lefkowitz <glyph at twistedmatrix.com <mailto:glyph at twistedmatrix.com>> wrote:
> 
>> On Jan 27, 2017, at 3:49 PM, Jean-Paul Calderone <exarkun at twistedmatrix.com <mailto:exarkun at twistedmatrix.com>> wrote:
>> 
>> On Fri, Jan 27, 2017 at 6:21 PM, Glyph Lefkowitz <glyph at twistedmatrix.com <mailto:glyph at twistedmatrix.com>> wrote:
>> 
>>> On Jan 27, 2017, at 3:12 PM, Craig Rodrigues <rodrigc at crodrigues.org <mailto:rodrigc at crodrigues.org>> wrote:
>>> 
>>> 
>>> 
>>> On Fri, Jan 27, 2017 at 2:29 PM, Glyph Lefkowitz <glyph at twistedmatrix.com <mailto:glyph at twistedmatrix.com>> wrote:
>>> 
>>>> On Jan 27, 2017, at 2:03 PM, Craig Rodrigues <rodrigc at crodrigues.org <mailto:rodrigc at crodrigues.org>> wrote:
>>>> 
>>>> Hi,
>>>> I can't seem to create a ticket in Trac.  Can someone look?
>>>> 
>>> I can create tickets.  What behavior do you see?
>>> 
>>> 
>>> After entering all the fields to create the ticket, and then clicking submit, it would just hang
>>> without creating the ticket.
>> 
>> Forever? No timeout?  Just the HTTP POST never returns?
>> 
>> 
>> FWIW, I've been experiencing similar problems.  In my case, the POST doesn't return for as long as I care to wait (in one case, around 20 minutes).  Re-submitting, sometimes 3-5 times, generally results in a successful eventually.  This is with Chrome Version 54.0.2840.90 (64-bit) on Ubuntu 16.10.
> 
> I'm using Safari 10.0.3 (12602.4.8) on Sierra.
> 
> Interesting to check: I'm using HTTP/2 to talk to twistedmatrix.com <http://twistedmatrix.com/>.  Are either of you?  I wonder if this is a bug in the HTTP/2 stack or perhaps one of the HTTP/1.1 changes made to accommodate the HTTP/2 implementation.
> 
> My browser is not using HTTP/2 to talk to twistedmatrix.com <http://twistedmatrix.com/> (idnar suggests this is because lack of ALPN in twistedmatrix.com <http://twistedmatrix.com/>'s OpenSSL and lack of NPN in Chrome).

It might be interesting to upgrade to Twisted trunk to see if some of the HTTP server bugfixes that have landed will address this; however, I can't come up with a coherent theory as to why certain POSTs would just hang.

-g
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