# Unexpected response code:400 while using nginx\_tcp\_proxy\_module for WebSocket **URL:** \ **Category:** NGINX\ **Created:** [August 15, 2012, 4:30pm UTC](https://www.ruby-forum.com/t/unexpected-response-code-400-while-using-nginx-tcp-proxy-module-for-websocket/222159 "2012-08-15T16:30:24Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\ **Post date:** [August 15, 2012, 4:30pm UTC](https://www.ruby-forum.com/t/unexpected-response-code-400-while-using-nginx-tcp-proxy-module-for-websocket/222159/1 "2012-08-15T16:30:24Z")
Hello, We are trying to use nginx\_tcp\_proxy\_module for WebSocket with the back-end CometD/Jetty. Direct CometD exposed to public is working fine and it goes with WebSocket but through nginx the transport switch to long-poll after throwing above error. Following is the request-response headers I see while trying to establish the WebSocket connection. GET /CometServer/cometd HTTP/1.1 Upgrade: websocket Connection: Upgrade Host: [comet.example.com](http://comet.example.com) Origin: [http://comet.example.com](http://comet.example.com) Sec-WebSocket-Key: yL46RAYQU5/wH73WE6y0Xw== Sec-WebSocket-Version: 13 Sec-WebSocket-Extensions: x-webkit-deflate-frame Cookie: JSESSIONID=5v8ee7guk9y61x235jgu2t3ng; \_\_utma=260652952.1760465236.1333589697.1333589697.1342161899.2; \_\_utmz=260652952.1342161899.2.2.utmcsr=; BAYEUX\_BROWSER=7e3f11lg7gmow6t4mh5welcj5oxr HTTP/1.0 400 Bad Request Date: Wed, 15 Aug 2012 13:12:50 GMT Access-Control-Allow-Origin: [http://comet.example.com](http://comet.example.com) Access-Control-Allow-Credentials: true Content-Type: text/html;charset=ISO-8859-1 Cache-Control: must-revalidate,no-cache,no-store Content-Length: 1413 Server: Jetty(7.6.3.v20120416) X-Cache: MISS from proxy Connection: keep-alive I suspect this is due to CometD not seeing “Upgrade: websocket” header thus it considered as failed websocket request and return 400 “Unexpected response code” I fully understand that nginx is not natively support WebSocket as yet but we would like to try at least ngx\_tcp\_proxy module as it has a WebSocoket module. Following is my config. tcp { upstream websockets { server 172.17.241.191:8484; check interval=3000 rise=2 fall=5 timeout=1000; ``` } server { listen 172.17.241.191:9000; server_name comet.example.com; tcp_nodelay on; websocket_pass websockets; access_log /var/log/nginx/tcp_access.log; } ``` } nginx -V nginx version: nginx/1.2.1 built by gcc 4.1.2 20080704 (Red Hat 4.1.2-48) TLS SNI support disabled 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\_gzip\_static\_module –with-http\_random\_index\_module --with-http\_secure\_link\_module –with-http\_stub\_status\_module --with-mail\_ssl\_module --with-file-aio –with-debug --with-cc-opt=‘-O2 -g -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables’ --without-http\_uwsgi\_module –without-http\_scgi\_module --without-mail\_pop3\_module –without-mail\_imap\_module --without-mail\_smtp\_module –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/yaoweibin-nginx\_tcp\_proxy\_module-a40c99a –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/simpl-ngx\_devel\_kit-24202b4 –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/agentzh-echo-nginx-module-080c0a1 –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/agentzh-set-misc-nginx-module-87d0ab2 –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/mikewest-nginx-static-etags-25bfaf9 –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/nginx-sticky-module-1.0 –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/agentzh-memc-nginx-module-8befc56 –add-module=/usr/local/hirantha/rpmbuild/BUILD/nginx-1.2.1/contrib/agentzh-srcache-nginx-module-8df221e uname -rop 2.6.18-194.26.1.el5PAE i686 GNU/Linux I would appreciate some help from you guys. Thanks in advance. Posted at Nginx Forum: > **[Unexpected response code:400 while using nginx\_tcp\_proxy\_module for WebSocket](https://forum.nginx.org/read.php?2,229724,229724#msg-229724)** > > Hello, We are trying to use nginx\_tcp\_proxy\_module for WebSocket with the back-end CometD/Jetty. Direct CometD exposed to public is working fine and it goes with WebSocket but through nginx the transport switch to long-poll after throwing above... ---
**Author:** ![n1xman](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/13edae/32.png) [@n1xman](https://www.ruby-forum.com/u/n1xman)\ **Post date:** [August 15, 2012, 5:54pm UTC](https://www.ruby-forum.com/t/unexpected-response-code-400-while-using-nginx-tcp-proxy-module-for-websocket/222159/2 "2012-08-15T17:54:34Z")
Hi, Can you open an websocket for me to connect from internet? And tell me the test method? You can email me to my private email: removed\_email\_address@domain.invalid Thanks. 2012/8/15 n1xman [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):