看看 urllib2的源代码,似乎最简单的方法是子类化 HTTPRedirectHandler,然后使用 build _ opener 覆盖默认的 HTTPRedirectHandler,但这似乎需要很多(相对复杂的)工作来完成看起来应该很简单的事情。
Dive Into Python 有一个很好的章节介绍了如何使用 urllib2处理重定向。
>>> import httplib >>> conn = httplib.HTTPConnection("www.bogosoft.com") >>> conn.request("GET", "") >>> r1 = conn.getresponse() >>> print r1.status, r1.reason 301 Moved Permanently >>> print r1.getheader('Location') http://www.bogosoft.com/new/location
我第二个 olt 的指针指向 一头扎进巨蟒里。下面是一个使用 urllib2重定向处理程序的实现,比它应该做的工作更多吗?也许吧,耸耸肩。
import sys import urllib2 class RedirectHandler(urllib2.HTTPRedirectHandler): def http_error_301(self, req, fp, code, msg, headers): result = urllib2.HTTPRedirectHandler.http_error_301( self, req, fp, code, msg, headers) result.status = code raise Exception("Permanent Redirect: %s" % 301) def http_error_302(self, req, fp, code, msg, headers): result = urllib2.HTTPRedirectHandler.http_error_302( self, req, fp, code, msg, headers) result.status = code raise Exception("Temporary Redirect: %s" % 302) def main(script_name, url): opener = urllib2.build_opener(RedirectHandler) urllib2.install_opener(opener) print urllib2.urlopen(url).read() if __name__ == "__main__": main(*sys.argv)
我想这会有帮助
from httplib2 import Http def get_html(uri,num_redirections=0): # put it as 0 for not to follow redirects conn = Http() return conn.request(uri,redirections=num_redirections)
这是一个不遵循重定向的 urllib2处理程序:
class NoRedirectHandler(urllib2.HTTPRedirectHandler): def http_error_302(self, req, fp, code, msg, headers): infourl = urllib.addinfourl(fp, headers, req.get_full_url()) infourl.status = code infourl.code = code return infourl http_error_300 = http_error_302 http_error_301 = http_error_302 http_error_303 = http_error_302 http_error_307 = http_error_302 opener = urllib2.build_opener(NoRedirectHandler()) urllib2.install_opener(opener)
然而,最短的方法是
class NoRedirect(urllib2.HTTPRedirectHandler): def redirect_request(self, req, fp, code, msg, hdrs, newurl): pass noredir_opener = urllib2.build_opener(NoRedirect())
httplib2请求方法中的 redirections关键字是一条红鲱鱼。如果它接收到一个重定向状态代码,它将引发 RedirectLimit异常,而不是返回第一个请求。要返回初始响应,需要在 Http对象上将 follow_redirects设置为 False:
httplib2
redirections
RedirectLimit
Http
follow_redirects
False
import httplib2 h = httplib2.Http() h.follow_redirects = False (response, body) = h.request("http://example.com")
以下是 请求的做法:
import requests r = requests.get('http://github.com', allow_redirects=False) print(r.status_code, r.headers['Location'])