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I wrote a small piece of code to crawl the pictures in the Blog Park blog. This code is effective for some links, but some links report errors as soon as they are crawled. What is the reason?

#coding=utf-8

import urllib
import re
from lxml import etree

#解析地址
def getHtml(url):
    page = urllib.urlopen(url)
    html = page.read()
    return html

#獲取地址并建樹
url = "http://www.cnblogs.com/fnng/archive/2013/05/20/3089816.html"
html = getHtml(url)
html = html.decode("utf-8")
tree = etree.HTML(html)

#保存圖片至本地
reg = r'src="(.*?)" alt'
imgre = re.compile(reg)
imglist = re.findall(imgre, html)
x = 0
for imgurl in imglist:
    urllib.urlretrieve(imgurl, '%s.jpg' % x)
    x += 1

As shown in the figure, the image can be crawled correctly

If you change the url to

url = "http://www.cnblogs.com/baronzhang/p/6861258.html"

then report an error immediately

Please solve it, thank you!