Apps on GAE got OAuth error


#1

My app running on Google App Engine platform currently has difficulty interacting with the Twitter API, specifically with the oauth endpoint - https://api.twitter.com/oauth/request_token.

The exception stacktrace from the server log is as follows:

Caused by: java.io.IOException: Could not fetch URL: http://api.twitter.com/oauth/request_token
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.convertApplicationException(URLFetchServiceImpl.java:115)
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:42)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:417)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:296)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getResponseCode(URLFetchServiceStreamHandler.java:149)
at twitter4j.internal.http.HttpResponseImpl.(HttpResponseImpl.java:35)
at twitter4j.internal.http.HttpClientImpl.request(HttpClientImpl.java:168)
… 46 more

It appears that many apps running on GAE have similar problems.
Is it a known issue?

Thanks,