301 moved permanently

302 found

303 not modified

400 bad request

401 unauthorized

403 forbidden

404 not found

500 internal server error

501 not implementedh

URLError >HTTPError

URLError: not linked the internal server: no web connection; remote url not exit; HTTPError

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import urllib.error import urllib.request try:     urllib.request.urlopen("http://blog.cssdn.net") except urllib.error.URLError as e:     if hasattr(e,"code"):         print(e.code)         if hasattr(e,"reason"):             print(e.reason)