@Override
    public boolean isRetriable() {
        if (this.verb == Verb.GET && isRetriable == null) {
            return true;
        }
        return super.isRetriable();
    }
Test if the request is retriable. If the request is
a {@link Verb#GET} and {@link Builder#setRetriable(boolean)}
is not called, returns true. Otherwise, returns value passed in
{@link Builder#setRetriable(boolean)}
ribbon-httpclient/src/main/java/com/netflix/client/http/HttpRequest.java