GAE应用程序与本地服务器的行为不同

Question

我使用virtualenv并在我的项目libs文件夹中复制了site-packages文件夹的内容。

这是我的代码;

import sys, os
sys.path.append(os.path.join(os.path.dirname(__file__), "libs"))
import webapp2
from bs4 import BeautifulSoup
from ntlm import HTTPNtlmAuthHandler
import urllib2
import mechanize

class MainHandler(webapp2.RequestHandler):
    def get(self):
        usr = self.request.get('usr')
        password = self.request.get('pw')

        url = "http://www.dogus.edu.tr/dusor/"
        user = 'ata.dogus.edu.tr\\' + usr

        passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
        passman.add_password(None, url, user, password)
        auth_NTLM = HTTPNtlmAuthHandler.HTTPNtlmAuthHandler(passman)

        br = mechanize.Browser()

        br.handlers = [handler for handler in br.handlers if not isinstance(handler, (mechanize._http.HTTPRobotRulesProcessor))]
        br.add_handler(auth_NTLM)

        try:
            br.addheaders = [('Cookie', br.open(url).info().dict['set-cookie'].split(';')[0])]
        except KeyError:
            self.response.write('Hatali Sifre veya kullanici adi.')
            return

        response = br.open(url+'FrmMain.aspx')

        response = br.open(url+'FrmNot.aspx')
        rows = [row.contents for row in BeautifulSoup(response.read()).find_all('table', id='dgnot')[-1].find_all('tr', align='left')]

        dersler = [[i.string.strip() for i in row] for row in rows]

        resp = '\n<br><br>\n'.join([' - '.join(ders) for ders in dersler])
        print resp

        self.response.write(resp)
        self.response.write('AAAAA')

app = webapp2.WSGIApplication([
    ('/', MainHandler)
], debug=True)

def main():
    from paste import httpserver
    httpserver.serve(app, host='127.0.0.1', port='8080')

if __name__ == '__main__':
    main()

从virtualenv运行此脚本时，python http://127.0.0.1:8080/?usr=1331025&pw=123456会返回预期结果。但是，将我的应用程序上传到GAE后，我收到这样的错误;

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/main.py", line 27, in get
    br.addheaders = [('Cookie', br.open(url).info().dict['set-cookie'].split(';')[0])]
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/mechanize/_mechanize.py", line 203, in open
    return self._mech_open(url, data, timeout=timeout)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/mechanize/_mechanize.py", line 230, in _mech_open
    response = UserAgentBase.open(self, request, data)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/mechanize/_opener.py", line 204, in open
    response = meth(req, response)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/mechanize/_urllib2_fork.py", line 457, in http_response
    'http', request, response, code, msg, hdrs)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/mechanize/_opener.py", line 221, in error
    result = apply(self._call_chain, args)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/mechanize/_urllib2_fork.py", line 332, in _call_chain
    result = func(*args)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/ntlm/HTTPNtlmAuthHandler.py", line 99, in http_error_401
    return self.http_error_authentication_required('www-authenticate', req, fp, headers)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/ntlm/HTTPNtlmAuthHandler.py", line 35, in http_error_authentication_required
    return self.retry_using_http_NTLM_auth(req, auth_header_field, None, headers)
  File "/base/data/home/apps/s~dusorbb/1.375812550365780990/libs/ntlm/HTTPNtlmAuthHandler.py", line 63, in retry_using_http_NTLM_auth
    r._safe_read(int(r.getheader('content-length')))
AttributeError: HTTPResponse instance has no attribute '_safe_read'

此外，我尝试将库复制到应用程序文件夹的根目录并注释掉行sys.path.append(os.path.join(os.path.dirname(__file__), "libs"))并得到相同的错误。这可能是什么问题？