python - Httplib 无法处理特定域

Question

我有一个脚本，它使用 Python 中的 httplib 获取互联网上很多页面的 HTTP header 。

我的问题是关于 specific domain (可能还有其他人)，httplib 引发异常，我不明白为什么。

>>> import httplib
>>> http = httplib.HTTPConnection('iswtc.la')
>>> http.request('GET', '/a')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python2.6/httplib.py", line 914, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib64/python2.6/httplib.py", line 951, in _send_request
    self.endheaders()
  File "/usr/lib64/python2.6/httplib.py", line 908, in endheaders
    self._send_output()
  File "/usr/lib64/python2.6/httplib.py", line 780, in _send_output
    self.send(msg)
  File "/usr/lib64/python2.6/httplib.py", line 739, in send
    self.connect()
  File "/usr/lib64/python2.6/httplib.py", line 720, in connect
    self.timeout)
  File "/usr/lib64/python2.6/socket.py", line 553, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
socket.gaierror: [Errno -2] Name or service not known

这个特定域有什么不同，我该如何处理？

PS:这不是我的代码，因为它工作正常:

>>> http = httplib.HTTPConnection('bit.ly')
>>> http.request('GET', '/a')

Answer 1

bit.ly 存在，而 iswtc.la 不存在:

$ nslookup bit.ly

Non-authoritative answer:
Name:   bit.ly
Address: 69.58.188.39
Name:   bit.ly
Address: 69.58.188.40


$ nslookup iswtc.la

** server can't find iswtc.la: NXDOMAIN