some-.site.com在从Firefox或Python urllib.request打开时出错，但在Chrome中有效。 可能是什么问题？
在firefox中输出：
Server not found
在Python中：
socket.gaierror: [Errno -2] Name or service not known
During handling of the above exception, another exception occurred:
File "/usr/lib/python3.3/urllib/request.py", line 1251, in do_open
raise URLError(err)
urllib.error.URLError: <urlopen error [Errno -2] Name or service not known>