title: error when using task queue
body: <p>I have a google app engine.
  When i add a task to task queue to send email. I have this error:</p>
  
  <p>Request failed because URL requires user login. For requests invoked within App Engine (offline requests like Task Queue, or webhooks like XMPP and Incoming Mail), the URL must require admin login (or no login).</p>
  
  <p>my command is </p>
  
  <p>taskqueue.add(url='/mypage/operation/task', params={'key': operation.key()}</p>
  
  <p>Please help me to fix it.</p>
  
  <p>Thanks.</p>