using Flask to make web-app with Rpi for controlling LED's

web-led-loop-problem

I asked this question a few weeks ago in the Raspberry Pi Forum's.
Unfortunately no one got back to me. 
I am sure there is a simple solution to my problem. 

So I am making a really simple webapp, which has two buttons. 
One button starts a blink sequence on a multi-colored LED. 
The other button turns the multi-LED completely off.

The blink sequence requires a loop. 
The loop freezes the webapp. 
I can't figure out a way to break out of the loop.

Currently I have two addresses I want to act as the "switch".

http://localhost:8000/22/27/17/on
http://localhost:8000/22/27/17/off

(The numbers are the GPIO pins where LED's are connected, but there can only three right now.)

Again, the problem is that when I request the LED to be "on" it creates an infinite loop. 
So that when I go to the "off" address, the loop is still running.
The Flask app cannot pick up the new request, because the page is stuck in the loop.
I can't figure out how to insert a "break" into the loop. 
I need some other information from the request that can communicate to the running process. 
I don't know how to do this in Flask yet.

Here is a [link](https://github.com/callmeskywalker/tinker-wizrd/tree/master/web-led) to the code.