Soluciono problema para recibir peticiones incorporando CORS

src/main/java/com/example/demo/AppConfig.java

@@ -10,6 +10,12 @@ import spark.*;
 
 
 public class AppConfig {
 public class AppConfig {
     public static void main(String[] args) {
     public static void main(String[] args) {
+        before((request, response) -> {
+            response.header("Access-Control-Allow-Origin", "*");
+            response.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
+            response.header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");
+            response.type("application/json");
+        });
         get("/hello", (req, res) -> "Respeto");
         get("/hello", (req, res) -> "Respeto");
 
 
         get("/hello", (req, res) -> {
         get("/hello", (req, res) -> {

src/main/java/com/example/demo/SparkRest.java

@@ -7,11 +7,19 @@ import static spark.Spark.*;
 public class SparkRest
 public class SparkRest
 {
 {
     public static void main(String[] args) {
     public static void main(String[] args) {
+
         port(8088);
         port(8088);
         final CircuitoService circuitoService = new CircuitoServiceMapImpl()
         final CircuitoService circuitoService = new CircuitoServiceMapImpl()
         {};
         {};
 
 
-        post("/circuito", (request, response) -> {
+        before((request, response) -> {
+            response.header("Access-Control-Allow-Origin", "*");
+            response.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
+            response.header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");
+            response.type("application/json");
+        });
+
+        post("/circuitos", (request, response) -> {
             response.type("application/json");
             response.type("application/json");
 
 
             Circuito circuito = new Gson().fromJson(request.body(), Circuito.class);
             Circuito circuito = new Gson().fromJson(request.body(), Circuito.class);