id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
897	$pipe variable never set	mqudsi.neosmart.net@…		"The $pipe variable, documented at http://nginx.org/en/docs/http/ngx_http_core_module.html#variables is never being set to anything other than ""."" 

According to the documentation:
> “p” if request was pipelined, “.” otherwise (1.3.12, 1.2.7)

As I understand it, HTTP 1.1 requests with keepalive, HTTP 1.0 requets with manual ""Connection: keep-alive"", and HTTP 2.0 connections with h2 idle support enabled should all result in requests with $pipe = p 

However, for all three of these cases when logging $pipe in access_log, the result is always ""."" "	defect	closed	minor		nginx-core	1.9.x	invalid	pipe		FreeBSD  10.2-RELEASE FreeBSD 10.2-RELEASE #0 r286666: Wed Aug 12 15:26:37 UTC 2015     root@releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64	"nginx version: nginx/1.9.11
built with LibreSSL 2.1.9
TLS SNI support enabled
configure arguments: --prefix=/usr/local/etc/nginx --conf-path=/usr/local/etc/nginx/nginx.conf --sbin-path=/usr/local/sbin/nginx --pid-path=/var/run/nginx.pid --error-log-path=/var/log/nginx/error.log --http-client-body-temp-path=/var/tmp/nginx/client_body_temp --http-fastcgi-temp-path=/var/tmp/nginx/fastcgi_temp --http-proxy-temp-path=/var/tmp/nginx/proxy_temp --http-scgi-temp-path=/var/tmp/nginx/scgi_temp --http-uwsgi-temp-path=/var/tmp/nginx/uwsgi_temp --http-log-path=/var/log/nginx/access.log --user=www-data --group=www-data --with-http_ssl_module --with-http_realip_module --with-http_stub_status_module --with-http_v2_module --with-http_sub_module --add-module=../ngx_cache_purge --with-http_image_filter_module --with-http_gunzip_module --with-file-aio --with-ipv6 --with-openssl=../libressl-2.1.9 --with-pcre --with-pcre-jit --with-threads --with-google_perftools_module --with-zlib=../zlib/ --with-zlib-asm=pentium4 --with-cc-opt=' -Wno-error -Ofast -funroll-loops -march=native' --with-zlib-opt=-march=native"