On Jan 27, 2017, at 3:53 PM, Jean-Paul Calderone <exarkun@twistedmatrix.com> wrote:

My browser is not using HTTP/2 to talk to twistedmatrix.com (idnar suggests this is because lack of ALPN in 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.