How do I actually use WSGI?

Question

Suppose I have a function

def app2(environ, start_response)

If I know that a server implements WSGI, how can I tell the server to call app2 when it receives a HTTP request? app2 here is a function that takes a dictionary and returns a response (a WSGI application).

Answer 1

Depends on the server. The WSGI-Spec says nothing about that. But mod_wsgi for example expects to find the WSGI-Applications under the name application in the specified module, but you can configure that with the WSGICallableObject configuration directive.

Answer 2

If, as it sounds from your comment, your question is about Google App Engine, it provides a convenience function run_wsgi_app for running WSGI apps. So if your function is called app2, you would run

def main():
   run_wsgi_app(app2)

For more, see http://code.google.com/appengine/docs/python/tools/webapp/utilmodule.html#run_wsgi_app