Retry Count In Deferred.defer In GAE

I'm using GAE's 'deffered' library (python), which automatically retries the task in the event an exception is raised. Is there a way to know (within the task handler function) th

Solution 1:

There are several headers will be set automatically with task https://developers.google.com/appengine/docs/python/taskqueue/overview-push

X-AppEngine-TaskRetryCount, the number of times this task has been retried; for the first attempt, this value is 0. This number includes attempts where the task failed due to a lack of available instances and never reached the execution phase.

X-AppEngine-TaskExecutionCount, the number of times this task has previously failed during the execution phase. This number does not include failures due to a lack of available instances.

EDIT 1

These values can access:

num_tries  = self.request.headers.get('X-AppEngine-TaskRetryCount')

EDIT 2

http://webapp-improved.appspot.com/api/webapp2.html#webapp2.get_request

for defered try:

request = webapp2.get_request()