sample wsgi app

app.py

from werkzeug.routing import Map, Rule
from werkzeug.serving import run_simple
from werkzeug.wrappers import Request, Response


class WebApplication(object):
    def __init__(self, router=None) -> None:
        self.router = router

    def dispatch_request(self, request):
        adapter = self.router.bind_to_environ(request.environ)
        presenter, values = adapter.match()
        return presenter(request, values)

    def wsgi_app(self, environ, start_response):
        request = Request(environ)
        response = self.dispatch_request(request)
        return response(environ, start_response)

    def __call__(self, environ, start_response):
        return self.wsgi_app(environ, start_response)


class HomePresenter(object):
    def __call__(self, request, values):
        return Response('Welcome to Home Presenter')


if __name__ == '__main__':
    router = Map([
        Rule('/', endpoint=HomePresenter()),
    ])

    app = WebApplication(router)
    run_simple('127.0.0.1', 5000, app, use_debugger=True, use_reloader=True)