id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
428	SPDY and Proxy Cache prematurely closes connections	Phil Sweeney	Valentin V. Bartenev	"As originally reported via mailing list/forum (a while ago):
http://forum.nginx.org/read.php?2,233497,241193#msg-241193

When SPDY and proxy cache are both being used, nginx will prematurely close the connection to avoid sending the body to the client.  However with SPDY, there could be other items still to send, so this causes empty responses.  In my case, css/js/images come back empty to the browser occasionally.

Debug logs have been provided to Valentin V. Bartenev, who stated in April:

""Well, from what I've examined from your debug logs, it looks like a known feature of caching mechanism, that closes connection to prevent sending body to a client, while the whole response is receiving from upstream. It's not a big deal in http, but turns into serious issue with spdy.""

""The problem appears when the whole page is requested from upstream for caching purposes, but the client should not get its body (i.e. 304 response, or HEAD request).""

Didn't originally file a ticket here because Valentin hoped that rewrites going on at the time for the upstream code might fix this, but looks like it did not."	defect	closed	major		nginx-core		fixed	spdy proxy cache		Linux myserver 3.8.0-31-generic #46~precise1-Ubuntu SMP Wed Sep 11 18:21:16 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.5.6
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-http_auth_request_module --with-mail --with-mail_ssl_module --with-file-aio --with-http_spdy_module --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro' --with-ipv6"