1.Networked Programs
1.Internet
我们现在学习Internet部分，即平时我们浏览器做的事情，之后再学习客服端这部分
2.TCP 传输控制协议
3.Socket
HTTP80端口用来与浏览器沟通
4.Sockets in Python
mysock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)#like file open
#AF_INET refer i'm make an internet socket
#STREAM refer i'm make an stream socket
mysock.connect(('www.py4inf.com',80))
#在我们这个程序和www.py4inf.com的80端口间建立一个Sockets
Python天然支持TCP Sockets
docs.python.org/library/socket.html
2.From Sockets to Applications
1.HTTP 超文本传输协议
http://www.dr-chuck.com/page1.htm
protocol host document
2.Sockets
Click the Second Page is just a socket
3.Hacking HTTP
用telnet 加 GET去获取网页内容（Win7 默认不带telnet）
每次访问网页都是十几二十个GET，GET html、GET CSS、GET image....
3.Let's Write a Web Browser
1.An HTTP Request in Python
import socket
mysock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)#like file open
#AF_INET refer i'm make an internet socket
#STREAM refer i'm make an stream socket
mysock.connect(('www.py4inf.com',80))
#在我们这个程序和www.py4inf.com的80端口间建立一个Sockets
toSend='GET http://www.py4inf.com/code/romeo.txt HTTP/1.0\n\n'
mysock.send(toSend.encode('ascii'))
whileTrue:
data = mysock.recv(65)#65是buf长度，此处用来设置显示数据时的长度
if(len(data)<1):
break
print(data)
mysock.close()
2.编码错误，及其解决方法
使用encode 进行以下类型转换即可
toSend='GET http://www.py4inf.com/code/romeo.txt HTTP/1.0\n\n'
mysock.send(toSend.encode('ascii'))
3.Making HTTP Easier With urllib
socket比url更加接近底层，也就是说url更加简单。
socket是 Transport Layer ， url是 Application Layer
注：2.x版本python使用import urllib，但3.x版本python使用的是import urllib.request
import urllib.request
fhand=urllib.request.urlopen('http://www.py4inf.com/code/romeo.txt')
for line in fhand:
print(line.strip())
4.Like a file
urllib turn URLs into files，所以我们可以像操作文件一样操作它
import urllib.request
fhand=urllib.request.urlopen('http://www.py4inf.com/code/romeo.txt')
counts=dict()
for line in fhand:
words=line.split()
for word in words:
counts[word]=counts.get(word,0)+1
print(counts)
Words：
subtlety 微妙