id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
2231	proxy_cache_bypass sets variable defined in map	mr.oliver.nadj@…		"When I use the combination of 
{{{
    map $upstream_http_content_length $no_cache {
        default 1;
        ""~^[0-9]{1,6}$"" 0;
    }
}}} 
and `proxy_cache_bypass $no_cache;` it always defaults `1`.


Example:
{{{
user  nginx;
worker_processes  auto;
error_log  /dev/stdout info;
pid        /var/run/nginx.pid;
events {
    worker_connections  1024;
}
daemon off;
http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
    log_format  main  '$remote_addr - $remote_user [$time_local] ""$request"" '
                      '$status $body_bytes_sent ""$http_referer"" '
                      '""$http_user_agent"" ""$http_x_forwarded_for""';
    access_log  /dev/stdout;
    sendfile        on;
    keepalive_timeout  65;
	proxy_cache_path /tmp/nginx-cache levels=1:2 keys_zone=static-cache:200m max_size=45g inactive=60m use_temp_path=off;
    proxy_cache_key ""$scheme$host$request_uri"";

    map $upstream_http_content_length $no_cache {
        default 1;
        ""~^[0-9]{1,6}$"" 0;
    }

    server {
        listen       80 default_server;
        server_name _;
        location / {
            proxy_set_header Host ""docs.nginx.com"";
            proxy_cache  static-cache;
            proxy_ignore_headers Cache-Control;
            add_header X-Cache-Status $upstream_cache_status;
            set $proxy_cache_key $scheme$proxy_host$uri$is_args$args;
            proxy_cache_valid 5d;
            proxy_no_cache $no_cache;
            # if you uncomment the line below it makes $no_cache = 1
            # proxy_cache_bypass $no_cache;
            add_header X-No-Cache $no_cache;
            proxy_pass              https://docs.nginx.com:443;
        }
    }
}

}}}

checkout: `curl -I -s http://127.0.0.1/images/icons/NGINX-Docs-horiz-white-type.svg | grep X-`
"	defect	closed	minor		nginx-core	1.18.x	invalid			Linux 56cb0fc19e3d 5.11.0-25-generic #27~20.04.1-Ubuntu SMP Tue Jul 13 17:41:23 UTC 2021 x86_64 Linux	"nginx version: nginx/1.18.0
built with OpenSSL 1.1.1k  25 Mar 2021 (running with OpenSSL 1.1.1g  21 Apr 2020)
TLS SNI support enabled
configure arguments: --prefix=/var/lib/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --pid-path=/run/nginx/nginx.pid --lock-path=/run/nginx/nginx.lock --http-client-body-temp-path=/var/lib/nginx/tmp/client_body --http-proxy-temp-path=/var/lib/nginx/tmp/proxy --http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi --http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi --http-scgi-temp-path=/var/lib/nginx/tmp/scgi --with-perl_modules_path=/usr/lib/perl5/vendor_perl --user=nginx --group=nginx --with-threads --with-file-aio --with-http_ssl_module --with-http_v2_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_geoip_module=dynamic --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_auth_request_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_slice_module --with-http_stub_status_module --with-http_perl_module=dynamic --with-mail=dynamic --with-mail_ssl_module --with-stream=dynamic --with-stream_ssl_module --with-stream_realip_module --with-stream_geoip_module=dynamic --with-stream_ssl_preread_module --add-dynamic-module=/home/buildozer/aports/main/nginx/src/njs-0.3.8/nginx --add-dynamic-module=/home/buildozer/aports/main/nginx/src/ngx_devel_kit-0.3.1 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/ngx_cache_purge-2.5 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/nginx-dav-ext-module-3.0.0 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/echo-nginx-module-0.61 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/ngx-fancyindex-0.4.4 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/headers-more-nginx-module-0.33 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/lua-nginx-module-0.10.15 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/lua-upstream-nginx-module-0.07 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/nchan-1.2.7 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/nginx-http-shibboleth-2.0.1 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/redis2-nginx-module-0.15 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/set-misc-nginx-module-0.32 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/nginx-upload-progress-module-0.9.2 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/nginx-upstream-fair-0.1.3 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/nginx-rtmp-module-1.2.1 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/nginx-vod-module-1.25 --add-dynamic-module=/home/buildozer/aports/main/nginx/src/ngx_http_geoip2_module-3.3"