public void returnRequest() {
        if (!detached) {
            throw new IllegalStateException("Request not detached");
        }
        serverHandler.returnRequest();
    }
Return this request. This method may only be invoked after the
{@link #detach detach} method has been invoked, and only once
per request. Note that if you detach a method without invoking
this method, it will never be returned, causing a resource leak
(NB: not good).

@throws IllegalStateException if invoked inappropriately
jrt/src/com/yahoo/jrt/Request.java