python - 为什么 urllib2 对我不起作用？

Question

我在我的 ubuntu 10.04 32 位机器上用 python 2.6.5 安装了 3 个不同的 python 脚本。

所有这些都使用 urllib2，我总是得到这个错误:

urllib2.URLError: <urlopen error [Errno 110] Connection timed out>

为什么？

例子:

>>> import urllib2
>>> response = urllib2.urlopen("http://www.google.com")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.6/urllib2.py", line 391, in open
    response = self._open(req, data)
  File "/usr/lib/python2.6/urllib2.py", line 409, in _open
    '_open', req)
  File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.6/urllib2.py", line 1161, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/usr/lib/python2.6/urllib2.py", line 1136, in do_open
    raise URLError(err)
urllib2.URLError: <urlopen error [Errno 110] Connection timed out>



>>> response = urllib2.urlopen("http://search.twitter.com/search.atom?q=hello&rpp=10&page=1")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.6/urllib2.py", line 391, in open
    response = self._open(req, data)
  File "/usr/lib/python2.6/urllib2.py", line 409, in _open
    '_open', req)
  File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.6/urllib2.py", line 1161, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/usr/lib/python2.6/urllib2.py", line 1136, in do_open
    raise URLError(err)
urllib2.URLError: <urlopen error [Errno 110] Connection timed out>

更新:

$ ping google.com
PING google.com (72.14.234.104) 56(84) bytes of data.
64 bytes from google.com (72.14.234.104): icmp_seq=1 ttl=54 time=25.3 ms
64 bytes from google.com (72.14.234.104): icmp_seq=2 ttl=54 time=24.6 ms
64 bytes from google.com (72.14.234.104): icmp_seq=3 ttl=54 time=25.1 ms
64 bytes from google.com (72.14.234.104): icmp_seq=4 ttl=54 time=25.0 ms
64 bytes from google.com (72.14.234.104): icmp_seq=5 ttl=54 time=23.9 ms
^C
--- google.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4003ms
rtt min/avg/max/mdev = 23.959/24.832/25.365/0.535 ms


$ w3m http://www.google.com
w3m: Can't load http://www.google.com.

$ telnet google.com 80
Trying 1.0.0.0...
telnet: Unable to connect to remote host: Connection timed out

更新 2:

我在家，我正在使用路由器和接入点 :-。但是我刚刚注意到 Firefox 不适合我。但是 chrome、synaptic 和其他浏览器(如 Midori 和 Epiphany 等)确实可以工作。

更新 3:

>>> useragent = 'Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Ubuntu/10.04 Chromium/6.0.472.62 Chrome/6.0.472.62 Safari/534.3)'
>>> request = urllib2.Request('http://www.google.com/')
>>> request.add_header('User-agent', useragent )
>>> urllib2.urlopen(request)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.6/urllib2.py", line 391, in open
    response = self._open(req, data)
  File "/usr/lib/python2.6/urllib2.py", line 409, in _open
    '_open', req)
  File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.6/urllib2.py", line 1161, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/usr/lib/python2.6/urllib2.py", line 1136, in do_open
    raise URLError(err)
urllib2.URLError: <urlopen error [Errno 110] Connection timed out>

更新 4:

>>> socket.setdefaulttimeout(50)
>>> urllib2.urlopen('http://www.google.com')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.6/urllib2.py", line 391, in open
    response = self._open(req, data)
  File "/usr/lib/python2.6/urllib2.py", line 409, in _open
    '_open', req)
  File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.6/urllib2.py", line 1161, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/usr/lib/python2.6/urllib2.py", line 1136, in do_open
    raise URLError(err)
urllib2.URLError: <urlopen error [Errno 110] Connection timed out>

更新 5:

Wireshark 结果(数据包嗅探器):

火狐:http://bit.ly/chtynm

Chrome :http://bit.ly/9ZjILK

绿:http://bit.ly/cKilC4

midori 是另一个适合我的浏览器。只有 Firefox 不工作。

Answer 1

按照建议，首先对网络设置进行故障排除。

首先，检查您是否可以 ping 通您尝试连接的主机:

$ ping www.google.com

然后尝试使用 w3m 进行 HTTP 连接:

$ w3m http://www.google.com