python - KeyError: 'PATH_INFO' 使用 Pydev 和 Google App Engine 时

Question

我刚刚在 Ubuntu 12.10 下使用 Eclipse 开始使用 GAE，当我尝试运行示例应用程序时，我遇到了一个我无法解决的错误：

from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app

class MainPage(webapp.RequestHandler):

    def get(self):
        self.response.headers['Content-Type'] = 'text/plain'
        self.response.out.write('Hello, webapp World!')

application = webapp.WSGIApplication([('/', MainPage)], debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

我收到了这个错误：

    Traceback (most recent call last):
  File "/home/mordrec/workspace/helloworld/helloworld.py", line 20, in <module>
    main()
  File "/home/mordrec/workspace/helloworld/helloworld.py", line 17, in main
    run_wsgi_app(application)
  File "/opt/google_appengine/google/appengine/ext/webapp/util.py", line 98, in run_wsgi_app
    run_bare_wsgi_app(add_wsgi_middleware(application))
  File "/opt/google_appengine/google/appengine/ext/webapp/util.py", line 116, in run_bare_wsgi_app
    result = application(env, _start_response)
  File "/opt/google_appengine/google/appengine/ext/webapp/_webapp25.py", line 688, in __call__
    match = regexp.match(request.path)
  File "/opt/google_appengine/lib/webob_1_1_1/webob/request.py", line 303, in path
    urllib.quote(self.path_info, PATH_SAFE))
  File "/opt/google_appengine/lib/webob_1_1_1/webob/descriptors.py", line 23, in fget
    return req.environ[key]
KeyError: 'PATH_INFO'