1.浏览器发送一个HTTP请求；2.服务器收到请求，生成一个HTML文档；3.服务器把HTML文档作为HTTP响应的Body发送给浏览器；4.浏览器收到HTTP响应，从HTTP Body取出HTML文档并显示。

import socketdef handle_request(client):buf = client.recv(1024)client.send("HTTP/1.1 200 OK\r\n\r\n".encode("utf8"))client.send("<h1 style='color:red'>Hello, yuan</h1>".encode("utf8"))def main():sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)sock.bind(('localhost',8001))sock.listen(5)while True:connection, address = sock.accept()handle_request(connection)connection.close()if __name__ == '__main__':main()

简化的服务端

from wsgiref.simple_server import make_serverdef application(environ, start_response):start_response('200 OK', [('Content-Type', 'text/html')])return [b'<h1>Hello, web!</h1>']httpd = make_server('', 8080, application)print('Serving HTTP on port 8080...')
# 开始监听HTTP请求:
httpd.serve_forever()

from wsgiref.simple_server import make_serverdef application(environ, start_response):# start_response('200 OK', [('Content-Type', 'text/html')])print(environ['PATH_INFO'])path = environ['PATH_INFO']start_response('200 OK', [('Content-Type', 'text/html')])f1 = open("index1.html", "rb")data1 = f1.read()f2 = open("index2.html", "rb")data2 = f2.read()if path == "/test1":return [data1]elif path == "/test2":return [data2]else:return ["<h1>404</h1>".encode('utf8')]return [b'<h1>Hello, web!</h1>']httpd = make_server('', 8080, application)print('Serving HTTP on port 8080...')
# 开始监听HTTP请求:
httpd.serve_forever()

from wsgiref.simple_server import make_serverdef f1():f1=open("index1.html","rb")data1=f1.read()return [data1]def f2():f2=open("index2.html","rb")data2=f2.read()return [data2]def application(environ, start_response):print(environ['PATH_INFO'])path=environ['PATH_INFO']start_response('200 OK', [('Content-Type', 'text/html')])if path=="/test1":return f1()elif path=="/test2":return f2()else:return ["<h1>404</h1>".encode("utf8")]httpd = make_server('', 8080, application)print('Serving HTTP on port 8080...')# 开始监听HTTP请求:
httpd.serve_forever()

from wsgiref.simple_server import make_serverdef f1(req):print(req)print(req["QUERY_STRING"])f1=open("index1.html","rb")data1=f1.read()return [data1]def f2(req):f2=open("index2.html","rb")data2=f2.read()return [data2]import timedef f3(req):        #模版以及数据库
f3=open("index3.html","rb")data3=f3.read()times=time.strftime("%Y-%m-%d %X", time.localtime())data3=str(data3,"utf8").replace("!time!",str(times))return [data3.encode("utf8")]def routers():urlpatterns = (('/test1',f1),('/test2',f2),("/time",f3))return urlpatternsdef application(environ, start_response):print(environ['PATH_INFO'])path=environ['PATH_INFO']start_response('200 OK', [('Content-Type', 'text/html')])urlpatterns = routers()func = Nonefor item in urlpatterns:if item[0] == path:func = item[1]breakif func:return func(environ)else:return ["<h1>404</h1>".encode("utf8")]httpd = make_server('', 8080, application)print('Serving HTTP on port 8080...')# 开始监听HTTP请求:

httpd.serve_forever()