python 获取网页header

因之前想写python爬虫判断douban的页面重定向，故写了以下代码，获取网页头部信息, 返回响应码

conn = httplib.HTTPConnection(host)conn.request("GET",path)return conn.getresponse().status

HTTPConnection.request(method, url[, body[, headers]])

代码中使用了"HEAD"的http请求方法，故只会返回头信息，而不返回网页实体。

The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response.

ref:http://www.python.org/doc//current/library/httplib.html#httpconnection-objects

http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html