nginx and http/2

[Valentin V. Bartenev]

On Saturday 25 June 2016 21:00:37 CJ Ess wrote:
> I could use some help with this one - I took a big leap with enabling
> http/2 support and I got knocked back really quick. There seems to be an
> issue with POSTs and it seems to be more pronounced with ios devices (as
> much as you can trust user agents) but there were some non-ios devices that
> seemed to be having issues also. Unfortunately I had to pull the changes
> quickly so I didn't get to capture too much debugging information (plus all
> the connections were via tls 1.2 w/ diffie-hellman so even if I had quickly
> taken a packet dump I wouldn't have been able to decrypt it).
> 
> So I built a version of curl with http/2 support to try and reproduce:
> 
> curl 7.49.1 (x86_64-pc-linux-gnu) libcurl/7.49.1 OpenSSL/1.0.2h
> nghttp2/1.11.1
> Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp
> smb smbs smtp smtps telnet tftp
> Features: IPv6 Largefile NTLM NTLM_WB SSL TLS-SRP HTTP2 UnixSockets
> 
> I did a test POST request with http/1 and I got a 200 response.
> 
> I did the same POST request via http/2 and the tls handshake completed but
> the connection was closed shortly thereafter. The error I see in the log
> file is "client sent stream with data before settings were acknowledged
> while processing HTTP/2 connection" I see other references to this error on
> POST requests when I googled for it, but I didn't see a solution. This
> sounds like an interoperability issue but I'd be shocked if I'm the first
> one to find something like that.
> 
[..]

You're not the first one, so the problem was resolved by this change:
http://hg.nginx.org/nginx/rev/ce94f07d5082 (nginx 1.11.0)

  wbr, Valentin V. Bartenev