python模拟csdn的登录页面，可是登录失败，只是返回登陆页面的代码

Question

#!/usr/bin/python
#encoding=utf-8
import HTMLParser
import urlparse
import urllib
import urllib2
import cookielib
import string
import re

hosturl = 'http://my.csdn.net'
posturl = 'http://passport.csdn.net/account/login?from=http%3A%2F%2Fmy.csdn.net%2Fmy%2Fmycsdn'

cj = cookielib.LWPCookieJar()
cookie_support = urllib2.HTTPCookieProcessor(cj)
opener = urllib2.build_opener(cookie_support, urllib2.HTTPHandler)
urllib2.install_opener(opener)

h = urllib2.urlopen(hosturl)

headers = {'User-Agent' : 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)',
'Referer' : 'http://passport.csdn.net/account/login?from=http%3A%2F%2Fmy.csdn.net%2Fmy%2Fmycsdn'}

postData = { 'username':'*********',
'password':'*********',
'lt':'LT-1728924-nkb2bYmCwt30gGmFIxbF4bADYiW2bf',
'execution':'e4s1',
'_eventId':'submit'
}
postData = urllib.urlencode(postData)

request = urllib2.Request(posturl, postData, headers)
print request
response = urllib2.urlopen(request)
text = response.read()
print text

Answer 1

用fiddler去调试，看看和浏览器的提交有什么不同