<span style="font-size:18px;">req = urllib2.Request(url) 
req.add_header("User-Agent","Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36") 
req.add_header("GET",url) 
req.add_header("Host","blog.csdn.net") 
req.add_header("Referer","//www.jb51.net/")

html=urllib2.urlopen(req)


print html.read()

#-*-coding:utf-8-*- 
 
import urllib2 
import random 
 
url="//www.jb51.net/article/1.htm" 
 
my_headers=["Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36", 
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36", 
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0" 
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/537.75.14", 
"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)" 
  
] 
def get_content(url,headers): 
 ''''' 
 @获取403禁止访问的网页 
 ''' 
 randdom_header=random.choice(headers) 
 
 req=urllib2.Request(url) 
 req.add_header("User-Agent",randdom_header) 
 req.add_header("Host","blog.csdn.net") 
 req.add_header("Referer","//www.jb51.net/") 
 req.add_header("GET",url) 
 
 content=urllib2.urlopen(req).read() 
 return content 
 
print get_content(url,my_headers)