Question

我将此代码放在Google App Engine程序的顶部：

from google.appengine.api import urlfetch
urlfetch.set_default_fetch_deadline(60)

我正在使用开启器加载东西：

    cj = CookieJar()        

    opener = urllib2.build_opener(urllib2.HTTPCookieProcessor( cj ) )
    opener.addheaders = [ ( 'User-Agent', 'Mozilla/5.0 (Windows NT 6.1; WOW64)' ) ]

    resp = opener.open( 'http://www.example.com/' )

5秒后抛出异常：

 File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 404, in open
    response = self._open(req, data)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 422, in _open
    '_open', req)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 1222, in https_open
    return self.do_open(httplib.HTTPSConnection, req)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 1187, in do_open
    r = h.getresponse(buffering=True)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/gae_override/httplib.py", line 524, in getresponse
    raise HTTPException(str(e))
HTTPException: Deadline exceeded while waiting for HTTP response from URL: http://www.example.com

如何避免错误？

Answer 1

您是否尝试在.open()来电时设置超时？

resp = opener.open('http://example.com', None, 60)

如果达到set_default_fetch_deadline指定的超时，Python将抛出DownloadError或DeadlineExceededErrors例外：https://cloud.google.com/appengine/docs/python/urlfetch/exceptions

Answer 2

您还可以修补httplib2库并将截止日期设置为60秒

httplib2/__init__.py:
      def fixed_fetch(url, payload=None, method="GET", headers={},
                      allow_truncated=False, follow_redirects=True,
                      deadline=60):
          return fetch(url, payload=payload, method=method, headers=headers,
                       allow_truncated=allow_truncated,
                       follow_redirects=follow_redirects, deadline=60,
                       validate_certificate=validate_certificate)
      return fixed_fetch

这是一个解决方法。

HTTPException：等待来自URL的HTTP响应时超过截止时间

2 个答案: