请问为什么我的最后一行代码显示的结果很奇怪？
# -*- coding:utf-8 -*-
from urllib import request
import http.cookiejar
url="http://www.baidu.com"
print("第一种方法")
response1 = request.urlopen(url)
print(response1.getcode())
print(len(response1.read()))
print("第二种方法")
req=request.Request(url)
req.add_header("user-agent","Mpzilla/5.0")
response2=request.urlopen(req)
print(response2.getcode())
print(len(response2.read()))
print("第三种方法")
cj=http.cookiejar.CookieJar()
opener=request.build_opener(request.HTTPCookieProcessor(cj))
request.install_opener(opener)
response3=request.urlopen(url)
print(response3.getcode())
print(cj)
print(response3.read())
去掉最后一行代码的结果是正常的
