a minimal "hello world" wsgi application

hellowsgi.py

from cgi import parse_qs, escape

def application(environ, start_response):
    parameters = parse_qs(environ.get('QUERY_STRING', ''))
    if 'subject' in parameters:
        subject = escape(parameters['subject'][0])
    else:
        subject = 'World'
    start_response('200 OK', [('Content-Type', 'text/html')])
    return ['Hello %(subject)s' % {'subject': subject}]

if __name__ == '__main__':
    from wsgiref.simple_server import make_server
    srv = make_server('localhost', 8080, application)
    srv.serve_forever()