Changed CORS Config backend.

00-backend/src/main/java/de/htwsaar/webshop/config/WebConfig.java

@@ -11,6 +11,10 @@ public class WebConfig implements WebMvcConfigurer {
 
     @Override
     public void addCorsMappings(CorsRegistry registry) {
-        registry.addMapping("/**");
+        registry.addMapping("/**")
+            .allowedOrigins("http://localhost:5173") // Erlaube Anfragen von der Frontend-Domain
+            .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS") // Erlaube spezifische HTTP-Methoden
+            .allowedHeaders("*") // Erlaube alle Header
+            .allowCredentials(true); // Erlaube Cookies
     }
 }