urllib判断重定向

python3中的urllib库里的重定向判断，响应码出现302为重定向，以访问百度为例：

from urllib import request

class NoRedirHandler(request.HTTPRedirectHandler):
    def http_error_302(self, req, fp, code, msg, headers):
        return fp
    http_error_301 = http_error_302

# other_handler = ...
opener = request.build_opener(NoRedirHandler)
rsp = opener.open('https://baidu.com')

print(rsp.code)
#>> 302
#rsp.read()
#>> b''

运行结果：

302

Process finished with exit code 0