Python FastCGI Application and LiteSpeed

This is a generic FCGI how-to for Python applications. Although we use Jon's fcgi python library for this example, you can use any valid Python FCGI module for your own setup.

Live Demo: http://www.litespeedtech.com/products/webserver/demo/

1. LiteSpeed
2. Python
3. Jon's Python FCGI library: jonpy.sourceforge.net

1) Create a Virtual Host for this setup. From now on we will refer to this vhost as PythonVhost.

2) Save the following sample Python FCGI application to a path of your choice. We will call this app “demoapp.py” for tutorial purposes.

#!/usr/bin/python
import jon.cgi as cgi
import jon.fcgi as fcgi
from cgi import escape
import traceback

class Handler(cgi.Handler):
  def process(self, req):
    req.set_header("Content-Type", "text/html")
    req.write("Hello Python! Hello LiteSpeed!<hr size=1>")
    keys = req.environ.keys()
    keys.sort()
    for k in keys:
        req.write(escape(k) + " = " + escape(req.environ[k]) + "<br>")
    req.write(traceback.print_exc())

fcgi.Server({fcgi.FCGI_RESPONDER: Handler}).run()

3) Go “PythonVhost → External Apps” tab and create a new “External Application”.

Name: MyPythonFCGI	
Address: uds://tmp/lshttpd/mypythonfcgi.sock
Max Connections: 10
Initial Request Timeout (secs): 10
Retry Timeout (secs): 0
Persistent Connection	Yes
Connection Keepalive Timeout: 30
Response Bufferring: No	
Auto Start: Yes
Command: /absolutepathto/demoapp.py  <--- path to python fcgi app
Back Log: 50
Instances: 10

4) Go to “PythonVhost → Contexts” and create a new “FCGI Context”.

URI: /python/   <--- URI path to bind to python fcgi app we created	
Fast CGI App: [VHost Level] MyPythonFCGI  <--- select the python extapp we just created

5) Restart LiteSpeed, “lswsctrl restart”, and access your new Pythyon FCGI application with /python/ url to your vhost. Enjoy!