applyBind = function applyBind() {
		return $reflectApply(bind, $apply, arguments);
	}
Use the given middleware function, with optional path, defaulting to "/".

Use (like `.all`) will run for any http METHOD, but it will not add
handlers for those methods so OPTIONS requests will not consider `.use`
functions even if they could respond.

The other difference is that _route_ path is stripped and not visible
to the handler function. The main effect of this feature is that mounted
handlers can operate without any code changes regardless of the "prefix"
pathname.

@public