id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
622	Use upstream headers in proxy_pass and proxy_cache_key	Dobes Vandermeer		"I wanted to do something like:

{{{
proxy_cache_key $upstream_x_accel_cache_key;
proxy_pass $upstream_x_accel_remote_url;
}}}

So that my app server could tell nginx a URL to proxy to and a cache key to use for that response.

However, it seems like this doesn't work - the variables always turn up blank even though they can be used in other places.

Variables defined using the `map` directive also seem to be ignored by `proxy_pass` and `proxy_cache_key`.
"	defect	closed	minor		nginx-core	1.6.x	invalid			Linux dobes-VirtualBox 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.6.0
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-ipv6 --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_addition_module --with-http_dav_module --with-http_geoip_module --with-http_gzip_static_module --with-http_image_filter_module --with-http_spdy_module --with-http_sub_module --with-http_xslt_module --with-mail --with-mail_ssl_module --add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-auth-pam --add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-dav-ext-module --add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-echo --add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-upstream-fair --add-module=/build/buildd/nginx-1.6.0/debian/modules/ngx_http_substitutions_filter_module
"