python – DeadlineExceededError:ApplicationError:5使用urllib2.urlopen()函数

在我的应用程序中,我使用urllib2.urlopen()函数调用api并从该api获取结果.但这不能正常工作.有时它会显示结果但有时会出现以下错误:

Traceback (most recent call last):
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 700, in __call__
handler.get(*groups)
  File "/base/data/home/apps/s~malware-app/7.351334968546050391/main.py", line 505, in get
f = urllib2.urlopen('http://whoapi.com/api-v1/?domain=%s&rtype=alexarank&apikey=xyz'% domain)
  File "/base/python_runtime/python_dist/lib/python2.5/urllib2.py", line 124, in urlopen
    return _opener.open(url, data)
  File "/base/python_runtime/python_dist/lib/python2.5/urllib2.py", line 381, in open
response = self._open(req, data)
  File "/base/python_runtime/python_dist/lib/python2.5/urllib2.py", line 399, in _open
  '_open', req)
  File "/base/python_runtime/python_dist/lib/python2.5/urllib2.py", line 360, in _call_chain
result = func(*args)
  File "/base/python_runtime/python_dist/lib/python2.5/urllib2.py", line 1114, in http_open
return self.do_open(httplib.HTTPConnection, req)
  File "/base/python_runtime/python_dist/lib/python2.5/urllib2.py", line 1087, in do_open
r = h.getresponse()
  File "/base/python_runtime/python_dist/lib/python2.5/httplib.py", line 197, in getresponse
self._allow_truncated, self._follow_redirects)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/urlfetch.py", line 260, in fetch
return rpc.get_result()
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 592, in get_result
return self.__get_result_hook(self)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/urlfetch.py", line 364, in _get_fetch_result
raise DeadlineExceededError(str(err))
DeadlineExceededError: ApplicationError: 5 

我看到了try-except方法,但它对我的代码起作用.
我的代码块:

 try:                      
   f = urllib2.urlopen('http://whoapi.com/api-v1/?domain=%s&rtype=serverip&apikey=xyzxyz'% domain)
   ip = f.read()
 except DeadlineExceededError, e:
   self.redirect('/error')

我正在进口:

from google.appengine.runtime import DeadlineExceededError

从stackoverflow我得到它的bcause服务器在指定的时间没有响应,我们可以处理异常..am但不能这样做.
任何帮助,将不胜感激.
谢谢您的帮助

最佳答案
URL提取请求的默认超时仅为5秒,因此您可能希望通过直接使用urlfetch来增加它:

from google.appengine.api import urlfetch

try:
    resp = urlfetch.fetch('http://whoapi.com/api-v1/?domain=%s&rtype=serverip&apikey=xyzxyz'% domain, method=urlfetch.GET, deadline=10)
    ip = r.content
except urlfetch.DownloadError:
    self.redirect('/error')

如果您始终发现超过它,请考虑使用asynchronous requests或将逻辑移动到任务队列.

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