You're misunderstanding the setTimeout function.
The setTimeout function takes a function and executes it later.
By writing setTimeout(doRequest(url,proxys[proxy]), proxytimeout), you're _calling the doRequest function (immediately), and passing the result (assuming that it returns another function) to setTimeout.
You need to pass doRequest's parameters to setTimeout, like this:
setTimeout(doRequest, proxytimeout, url, proxys[proxy]);
This will pass setTimeout the doRequest function itself (without calling it first), and will also pass it the parameters to give to doRequest when it finally calls it.
