CGI is a standard protocol to run dynamic web-apps using HTTP protocol. It's advantage: standard, available everywhere, disadvantages: it's slow (a process is created for every HTTP request). To overcome this limitations FastCGI has been created (one process serves many HTTP requests). But not everywhere FastCGI is supported. I'll show how to use special bridge to use FastCGI on CGI-only environment.
First, we have to download current FastCGI development kit then compile cgi-fcgi binary usging the same architecture as our hosting provider uses. Then copy compiled binary to server and create small script to run our bridge, lets name it app.bridge:
#! ./cgi-fcgi -f -connect app.sock app.fcgi 1
Here "1" means: create one process, multiple requests will be handled by internal thread manager in application. If your application is not multi threaded you can pass higher number here.
The bridge file must have correct permissions and the following fragment must be added to .htaccess to allow to call this bridge script:
Options +ExecCGI AddHandler cgi-script .bridge
That's all, folks!