Question

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

我为此看到了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')

我正在导入：

from google.appengine.runtime import DeadlineExceededError

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

Answer 1

网址提取请求的默认超时时间仅为5秒，因此您可能希望直接使用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或将逻辑移至任务队列。

Answer 2

正如您所说，错误的发生是因为您未及时得到回复，并且请求超出了截止日期。

您可以做的是将请求移动到任务队列中，因为任务可以运行更长时间。

至于捕获异常，您是否尝试在self.redirect之后添加一个return语句？

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

2 个答案: