On Thu, Dec 8, 2016 at 3:12 AM, William A Rowe Jr <wr...@rowe-clan.net> wrote: > On Dec 7, 2016 6:23 PM, "Jacob Champion" <champio...@gmail.com> wrote: > > On 12/07/2016 04:00 PM, William A Rowe Jr wrote: >> >> Consider for a moment the case of an HTTP/1.1 upgrade request >> unrecognized by a proxy agent. > > > It was my understanding that this is an impossible situation for a > conforming proxy, since Upgrade is hop-by-hop. What am I missing? > > > The fact that there is no way for us to predict what new headers we are > passed in the future are defined in the future to be hop-by-hop, which > result in a 105 response code with a similarly imponderable conundrum. No > way for RFC2068 servers to know 101 became a hop by hop unhandleable > response.
"Connection: Upgrade, ..." is a MUST when the Upgrade header is used, so servers/proxies do know.
