#coding=utf-8
 
import urllib2
import urllib
import time
import socket

ip_check_url = 'http://www.google.com.hk/'
user_agent = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0'
socket_timeout = 30
 
# Check proxy
def check_proxy(protocol, pip): 
  try:
    proxy_handler = urllib2.ProxyHandler({protocol:pip})
    opener = urllib2.build_opener(proxy_handler)
    # opener.addheaders = [('User-agent', user_agent)] #这句加上以后无法正常检测，不知道是什么原因。
    urllib2.install_opener(opener)

    req = urllib2.Request(ip_check_url)
    time_start = time.time()
    conn = urllib2.urlopen(req)
    # conn = urllib2.urlopen(ip_check_url)
    time_end = time.time()
    detected_pip = conn.read()
    
    proxy_detected = True
 
  except urllib2.HTTPError, e:
    print "ERROR: Code ", e.code
    return False 
  except Exception, detail:
    print "ERROR: ", detail
    return False
 
  return proxy_detected

def main():
  socket.setdefaulttimeout(socket_timeout)
 
  print
  
  protocol = "http"
  current_proxy = "212.82.126.32:80" 
  proxy_detected = check_proxy(protocol, current_proxy)
  if proxy_detected:
    print (" WORKING: " + current_proxy)
  else:
    print " FAILED: %s " % ( current_proxy, )

if __name__ == '__main__':
  main()

[root@bogon proxyipspider]# python checkproxy.py 

 WORKING: 212.82.126.32:80