我发现了这段代码,它对我来说是可靠和高效的,但不幸的是,它是为python2编写的,而且它还使用了urllib2,而大家都在说请求更快。在python3中,下面的代码(或者更高效、更可靠)的等价代码是什么?在
#!/usr/bin/env python
#-*- coding:utf-8 -*-
import sys
import urllib2
# This script uses HEAD requests (with fallback in case of 405)
# to follow the redirect path up to the real URL
# (c) 2012 Filippo Valsorda - FiloSottile
# Released under the GPL license
class HeadRequest(urllib2.Request):
def get_method(self):
return "HEAD"
class HEADRedirectHandler(urllib2.HTTPRedirectHandler):
"""
Subclass the HTTPRedirectHandler to make it use our
HeadRequest also on the redirected URL
"""
def redirect_request(self, req, fp, code, msg, headers, newurl):
if code in (301, 302, 303, 307):
newurl = newurl.replace(' ', '%20')
newheaders = dict((k,v) for k,v in req.headers.items()
if k.lower() not in ("content-length", "content-type"))
return HeadRequest(newurl,
headers=newheaders,
origin_req_host=req.get_origin_req_host(),
unverifiable=True)
else:
raise urllib2.HTTPError(req.get_full_url(), code, msg, headers, fp)
class HTTPMethodFallback(urllib2.BaseHandler):
"""
Fallback to GET if HEAD is not allowed (405 HTTP error)
"""
def http_error_405(self, req, fp, code, msg, headers):
fp.read()
fp.close()
newheaders = dict((k,v) for k,v in req.headers.items()
if k.lower() not in ("content-length", "content-type"))
return self.parent.open(urllib2.Request(req.get_full_url(),
headers=newheaders,
origin_req_host=req.get_origin_req_host(),
unverifiable=True))
# Build our opener
opener = urllib2.OpenerDirector()
for handler in [urllib2.HTTPHandler, urllib2.HTTPDefaultErrorHandler,
HTTPMethodFallback, HEADRedirectHandler,
urllib2.HTTPErrorProcessor, urllib2.HTTPSHandler]:
opener.add_handler(handler())
response = opener.open(HeadRequest(sys.argv[1]))
print(response.geturl())
顺便说一句,我并不需要Head请求。我只想知道这个链接是不是坏了(在一些网站,如果你给他们一个坏代码,他们会把你重定向回网站的主页,我想我的代码也认识到这一点)和头请求是最有效的解决方案,我想到了这一点,所以如果你知道任何更好的方法,我也会很感激。在
看看请求:http://docs.python-requests.org/en/master/
要执行head请求,只需:
然后您可以访问该对象以获取所需的内容。例如,状态代码:
^{pr2}$更新: 如果您想检查一个页面是否处于活动状态,您需要执行一个GET请求。我见过HEAD请求返回一个
200
响应,在同一个URL上,GET请求返回500
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