I was trying to make some code that would check the value of bitcoin, and got an error. I figured out that I had removed a delay, and it was doing GET requests very fast. I put back the delay and it was fine. So, was the problem that the webserver thought I was DoSing? I was checking the value from http://coindesk.com if that helps.
Well yeah, if you're sending GET requests as fast as your computer can, it's definitely going to think you're trying a crude DoS attack on it.
Are you using their API? http://www.coindesk.com/api/
That says it updates their data every minute, so there's no point in grabbing data any faster than that.