Recover from DoS

[zcorpan]

I was ad-hoc testing image loading and used ?pipe=trickle(...) with a multi-second delay with wpt.live, which ended up DoSing the server entirely for a few minutes. cc @foolip @jgraham

[jcscottiii]

Hey @zcorpan do you remember the approximate requests per second when you did this? (I am relatively new to the project. Trying to get an understanding of the scale of the requests)

[zcorpan]

I think it must have been less than 10 requests per second at most since I tested manually in 3 browsers and reloaded the page a few times, with a demo that only issued a single trickled request.