protected void redirectToReferrer() {
        String referrer = context.requestHeader("Referer");
        referrer = referrer == null? context.contextPath()/*injector.getInstance(DeploymentInfo.class).getContextPath()*/ : referrer;
        redirect(referrer);
    }
protected void redirectToReferrer ( ) { String referrer = context . requestHeader ( "Referer" ) ; referrer = referrer == null ? context . contextPath ( ) : referrer ; redirect ( referrer ) ; }
Redirects to referrer if one exists. If a referrer does not exist, it will be redirected to
the root of the application.

@return {@link HttpSupport.HttpBuilder}, to accept additional information.