id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,uname,nginx_version 1383,Error if using proxy_pass with variable and limit_except,Haxe18@…,,"Hi nginx guys, i use a nginx in front of a varnish server. I purge my varnish via purge method. Nginx uses the following VHost config: {{{ server { listen *:80 default_server; location / { limit_except GET POST { allow 127.0.0.1/32; deny all; } set $upstream http://127.0.0.1:8080; if ($http_user_agent = 'mobile') { set $upstream http://127.0.0.1:8080; } proxy_pass $upstream; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } }}} Suggested: From not localhost i only can request GET/HEAD/POST, localhost can do everything. From remote it works as expected: {{{ root@test:~# curl -X PURGE -I EXTIP HTTP/1.1 403 Forbidden Server: nginx Date: Mon, 18 Sep 2017 10:39:23 GMT Content-Type: text/html Content-Length: 162 Connection: keep-alive Vary: Accept-Encoding }}} But from localhost: {{{ root@test:~# curl -X PURGE -I http://127.0.0.1 HTTP/1.1 500 Internal Server Error Server: nginx Date: Mon, 18 Sep 2017 10:39:06 GMT Content-Type: text/html Content-Length: 186 Connection: close }}} Nginx error log tells me: {{{ ==> /var/log/nginx/error.log <== 2017/09/18 12:39:06 [error] 2483#2483: *2 invalid URL prefix in """", client: 127.0.0.1, server: , request: ""PURGE / HTTP/1.1"", host: ""127.0.0.1"" }}} Without using Variables in VHost: {{{ server { listen *:80 default_server; location / { limit_except GET POST { allow 127.0.0.1/32; deny all; } proxy_pass http://127.0.0.1:8080; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } }}} Works as expected: {{{ root@test:~# curl -X PURGE -I http://127.0.0.1 HTTP/1.1 200 OK Server: nginx Date: Mon, 18 Sep 2017 10:45:35 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Vary: Accept-Encoding }}} Other tests with a variable proxy_pass e.g. using the get method instead of purge also fails with same error. Please take a look why nginx fails when combining limit_except with proxypass and variables. Thanks",defect,accepted,minor,,nginx-core,1.12.x,,,,Linux test 3.16.0-4-amd64 #1 SMP Debian 3.16.43-2+deb8u3 (2017-08-15) x86_64 GNU/Linux,"nginx version: nginx/1.12.1 built by gcc 4.9.2 (Debian 4.9.2-10) built with OpenSSL 1.0.1t 3 May 2016 TLS SNI support enabled configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --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-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie'"