Running A Loop Until You See A Particular Result

[knight2000]

but the problem is that when it does find a working proxy (response = 200), it still continues to check every other proxy anyway

Then add a break statement to exit the while loop after a successful connection.
And by the way, why do you want a random proxy? It might happen a false proxy is tried more than one time. It seems better to try the proxies in sequence. You may even try to change the order so the unsuccessful proxies are moved to the end.

Thank ibreeden.

The reason for a random proxy is that I watched several videos and read several blog posts and a few mentioned that it's better practice to randomize your list to avoid potential footprints- recommended, but not required.

You're right about it trying a false proxy more than once and in my testing over the last few days, I've noticed that proxies can die within minutes, so your list pool is constantly changing.