Habilitar CORS con Spark-Java

/** Ver en: https://gist.github.com/saeidzebardast/e375b7d17be3e0f4dddf */ options("/*", (request, response) -> { String accessControlRequestHeaders = request .headers("Access-Control-Request-Headers"); if (accessControlRequestHeaders != null) { response.header("Access-Control-Allow-Headers", accessControlRequestHeaders); } String accessControlRequestMethod = request .headers("Access-Control-Request-Method"); if (accessControlRequestMethod != null) { response.header("Access-Control-Allow-Methods", accessControlRequestMethod); } return "OK"; }); before((request, response) -> response.header("Access-Control-Allow-Origin", "*"));