One of the issues I ran into was that my task would not execute. I set up the code in its own CodeIgniter controller and I was able to directly access it with my web browser, but when I added the URL to the task queue, it would just sit there. It would try to execute, but nothing would happen. I found my first clue in my AppEngine logs, which read something like this:
INFO 2013-11-06 02:52:10,700 module.py:608] default: "POST /worker/process_set HTTP/1.1" 302 -WARNING 2013-11-06 02:52:10,700 taskqueue_stub.py:1980] Task task4 failed to execute. This task will retry in 0.800 seconds
A task has to return a status between 200 and 299 (inclusive), so that 302 was the clue. 302 is the code for Found and usually is followed by an HTTP redirect Location header. I tried several different things, but what finally worked was declaring the worker path explicitly in my app.yaml (vs. letting the default handler take care of it). This is something I would have to do eventually to lock down the URL from any external requests.
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