Python 获取URL访问的HEAD头信息

主要给出两个版本，一个是通过 urllib 实现的，另一个是通过 urllib2 实现的，此为第二种，代码及实例如下：

>>> import urllib2
>>> from urllib2 import *
>>> webUrl = "http://www.baidu.com"
>>> doc = urllib2.urlopen(webUrl)
>>> print doc.info() #或 doc.headers

打印信息

Date: Mon, 24 Nov 2014 07:22:07 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: Close
Vary: Accept-Encoding
Set-Cookie: BAIDUID=6F43AAA51E609EB80D9C0A18BB11720D:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: BAIDUPSID=6F43AAA51E609EB80D9C0A18BB11720D; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: BDSVRTM=0; path=/
Set-Cookie: BD_HOME=0; path=/
Set-Cookie: H_PS_PSSID=7931_10161_1433_7800_9452_10120_10016_9499_10051_10065_9967_9769_9105_9757_10007_9979_9024; path=/; domain=.baidu.com
P3P: CP=" OTI DSP COR IVA OUR IND COM "
Cache-Control: private
Cxy_all: baidu+86091fc3efbc80d96c839cee1b7a0a36
Expires: Mon, 24 Nov 2014 07:21:28 GMT
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