python网络学习（02）

我们写出一个HTTP服务器端&＃xff1a;

#coding;utf-8
import socket# Address
HOST &＃61; &＃39;&＃39;
PORT &＃61; 8000# Prepare HTTP response
text_content &＃61; &＃39;&＃39;&＃39;HTTP/1.x 200 OK
Content-Type: text/html





Wow, Python Server




&＃39;&＃39;&＃39;# Read picture, put into HTTP format
f &＃61; open(&＃39;test.jpg&＃39;,&＃39;rb&＃39;)
pic_content &＃61; &＃39;&＃39;&＃39;
HTTP/1.x 200 OK
Content-Type: image/jpg&＃39;&＃39;&＃39;
pic_content &＃61; pic_content &＃43; f.read()
f.close()# Configure socket
s &＃61; socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))# infinite loop, server forever
while True:# 3: maximum number of requests waitings.listen(3)conn, addr &＃61; s.accept()request &＃61; conn.recv(1024)method &＃61; request.split(&＃39; &＃39;)[0]src &＃61; request.split(&＃39; &＃39;)[1]# deal with GET methodif method &＃61;&＃61; &＃39;GET&＃39;:# ULRif src &＃61;&＃61; &＃39;/test.jpg&＃39;:content &＃61; pic_contentelse: content &＃61; text_contentprint &＃39;Connected by&＃39;, addrprint &＃39;Request is:&＃39;, requestconn.sendall(content)# close connection


如我们上面所看到的&＃xff0c;服务器会根据request向客户传输的两条信息text_content和pic_content中的一条&＃xff0c;作为response文本。整个response分为起始行(start line), 头信息(head)和主体(body)三部分。起始行就是第一行:

它实际上又由空格分为三个片段&＃xff0c;HTTP/1.x表示所使用的HTTP版本&＃xff0c;200表示状态(status code)&＃xff0c;200是HTTP协议规定的&＃xff0c;表示服务器正常接收并处理请求&＃xff0c;OK是供人来阅读的status code。