部署Django网站后使用apache和mod_wsgi出现Socket错误？

Question

我网站上有一个后台功能，它会调用 urllib.urlopen(url) 来从指定的地址获取数据。部署后，其他功能都正常工作，只有这个功能出问题了。调用这个功能时出现了 [Errno socket error] [Errno -2] Name or service not known 的错误。看起来它找不到主机。

但是如果我用 python manage.py runserver 来运行网站，这个功能就能正常工作。

我在想，可能是Apache有问题，但我找不到具体原因。谢谢你的帮助。

这是这个功能的代码：

WORD_URL = 'http://dict.cn/ws.php?utf8=true&q=%s'

def get_word(word):
    url = WORD_URL % word
    dom = minidom.parse(urllib.urlopen(url))
    try:
        pron = dom.getElementsByTagName('pron')[0].firstChild.data
        definition = dom.getElementsByTagName('def')[0].firstChild.data
    except IndexError:
        pron = ''
        definition = ''
    return {
        'word':word,
        'pron':pron,
        'definition':definition
        }

这是错误追踪信息：

Traceback:
File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/home/jxq/djcode/wormo/core/views.py" in added
31.             xml_word = get_word(new_word)
File "/home/jxq/djcode/wormo/core/get_word.py" in get_word
8.     dom = minidom.parse(urllib.urlopen(url))
File "/usr/lib/python2.7/urllib.py" in urlopen
84.         return opener.open(url)
File "/usr/lib/python2.7/urllib.py" in open
205.                 return getattr(self, name)(url)
File "/usr/lib/python2.7/urllib.py" in open_http
342.         h.endheaders(data)
File "/usr/lib/python2.7/httplib.py" in endheaders
937.         self._send_output(message_body)
File "/usr/lib/python2.7/httplib.py" in _send_output
797.         self.send(msg)
File "/usr/lib/python2.7/httplib.py" in send
759.                 self.connect()
File "/usr/lib/python2.7/httplib.py" in connect
740.                                              self.timeout, self.source_address)
File "/usr/lib/python2.7/socket.py" in create_connection
553.     for res in getaddrinfo(host, port, 0, SOCK_STREAM):

Exception Type: IOError at /wormo/added/
Exception Value: [Errno socket error] [Errno -2] Name or service not known

httpd.conf 配置文件：

WSGIScriptAlias / /home/jxq/djcode/wormo/apache/django.wsgi

<Directory /home/jxq/djcode/wormo/apache>
    Order allow,deny
    Allow from all
</Directory>

Alias /media/ /home/jxq/djcode/wormo/media/

<Directory /home/jxq/djcode/wormo>
Order deny,allow
Allow from all
</Directory>

我电脑上同时安装了Python 3和Python 2.7，这会造成问题吗？

Answer 1

这可能是权限问题，或者是你使用的Apache环境出了什么问题。你可以试着用一个简单的WSGI脚本作为基础，来测试一下获取网址的功能：

import sys
import urllib    

def application(environ, start_response):
   page_text = urllib.urlopen("http://www.google.com/").read()
   start_response('200 OK', [
     ('Content-Type', 'text/html'),
     ('Content-Length', str(len(page_text))),
   ])
   yield page_text