web框架的本质具体都是些什么呢？

socket服务端

自定制web框架

    from wsgiref.simple_server import make_server

def index():

return b'index'

def login():

return b'login'

def routers():

urlpatterns = (

    ('/index/', index),

    ('/login/', login),

)

return urlpatterns

def RunServer(environ, start_response):

start_response('200 OK', [('Content-Type', 'text/html')])

url = environ['PATH_INFO']

urlpatterns = routers()

func = None

for item in urlpatterns:

    if item[0] == url:

        func = item[1]

        break

if func:

    return [func()]

else:

    return [b'404 not found']

if name == 'main':

httpd = make_server('127.0.0.1',8080,RunServer)

print("Serving HTTP on port 8080...")

httpd.serve_forever()