simple_wsgi.py

from wsgiref.simple_server import make_server

class AppClass:

    def __call__(self,environ, start_response):
        status = '200 OK'
        response_headers = [('Content-type', 'text/plain')]
        start_response(status, response_headers)
    return ["hello world!"]

app = AppClass()
httpd = make_server('', 8000, app)
print "Serving on port 8000..."
httpd.serve_forever()

wsgi_middleware.py

from wsgiref.simple_server import make_server

URL_PATTERNS= (
    ('hi/','say_hi'),
    ('hello/','say_hello'),
)

class Dispatcher(object):

    def _match(self,path):
        path = path.split('/')[1]
        for url,app in URL_PATTERNS:
            if path in url:
                return app

    def __call__(self, environ, start_response):
        path = environ.get('PATH_INFO','/')
        app = self._match(path)
        if app :
            app = globals()[app]
            return app(environ, start_response)
        else:
            start_response("404 NOT FOUND",[('Content-type', 'text/plain')])
            return ["Page not found!"]

def say_hi(environ, start_response):
    start_response("200 OK",[('Content-type', 'text/html')])
    return ["wsgi say hi to you!"]

def say_hello(environ, start_response):
    start_response("200 OK",[('Content-type', 'text/html')])
    return ["wsgi say hello to you!"]

app = Dispatcher()

httpd = make_server('', 8000, app)
print "Serving on port 8000..."
httpd.serve_forever()