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Fastcgi on nginx » History » Version 13

Peter Mortensen, 04/15/2011 10:32 PM
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1 13 Peter Mortensen
h1. FastCGI on nginx
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{{toc}}
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h3. About nginx 
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On paper, nginx is an excellent choice for use as a reverse proxy (together with wthttpd), or for deploying Wt applications using FastCGI, especially if you are using server-initiated updates (server push).
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The reason is that nginx, like wthttpd, is completely based on asynchronous I/O, and therefore scales easily to many open connections (unlike other web servers such as Apache, lighttpd, etc.). Server-initiated updates use an open connection for every web client.
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We have tested nginx succesfully for both its use as a reverse proxy or for FastCGI deployment of Wt applications. Its FastCGI implementation is a bit clumsy, but newer versions of nginx (>= 0.7.31) than the version currently available in ubuntu should improve on that.
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h3. Ubuntu configuration
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* Installing nginx and spawn-fcgi (which comes with lighttpd):
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<pre>
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 $ sudo apt-get install nginx lighttpd
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</pre>
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* Start your application (linked against wtfcgi) using spawn-fcgi. Spawn-fcgi wraps the FastCGI application to listen to a socket or network connection.
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<pre>
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 $ spawn-fcgi -n -f ../../build/examples/hello/hello.wt -a 0.0.0.0 -p 9091
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</pre>
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* Edit your nginx configuration to redirect a particular URL to your application (replace all occurences of /hello.wt with the path for your application!):
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<pre>
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        location /hello.wt {
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                fastcgi_pass   127.0.0.1:9091;
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                fastcgi_param  QUERY_STRING       $query_string;
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                fastcgi_param  REQUEST_METHOD     $request_method;
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                fastcgi_param  CONTENT_TYPE       $content_type;
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                fastcgi_param  CONTENT_LENGTH     $content_length;
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                if ($document_uri ~ "^/hello.wt/(.*)") {
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                        set $apache_path_info /$1;
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                }
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                fastcgi_param  SCRIPT_NAME        /hello.wt;
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                fastcgi_param  PATH_INFO          $apache_path_info;
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                fastcgi_param  REQUEST_URI        $request_uri;
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                fastcgi_param  DOCUMENT_URI       $document_uri;
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                fastcgi_param  DOCUMENT_ROOT      $document_root;
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                fastcgi_param  SERVER_PROTOCOL    $server_protocol;
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                fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
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                fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;
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                fastcgi_param  REMOTE_ADDR        $remote_addr;
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                fastcgi_param  REMOTE_PORT        $remote_port;
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                fastcgi_param  SERVER_ADDR        $server_addr;
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                fastcgi_param  SERVER_PORT        $server_port;
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                fastcgi_param  SERVER_NAME        $server_name;
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        }
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</pre>
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* Reload (or restart) your nginx server and you are ready to go:
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 $ sudo /etc/init.d/nginx restart
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