<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","http://blog.csdn.net/")</span> 

html=urllib2.urlopen(req)


print html.read()

#-*-coding:utf-8-*- 
 
import urllib2 
import random 
 
url="http://blog.csdn.net/qysh123/article/details/44564943" 
 
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","http://blog.csdn.net/") 
  req.add_header("GET",url) 
 
  content=urllib2.urlopen(req).read() 
  return content 
 
print get_content(url,my_headers)