import urllib,urllib2
#1.建立URL请求
url = 'http://www.baidu.com'
req = urllib2.Request(url)
#2.为URL请求添加信息
req.add_header('User-Agent', "Mozilla")
req.add_header('SpiderClient', ’spider‘)
#3.打开URL请求
response = urllib2.urlopen(req, timeout=timeout_s)
#4.保存html流
html_str = response.read()
http_status = response.code
header_str = str(response.info())