Fix: Add Access-Control-Allow-Credentials header for handshaking response

Author: vietlvq2609

src/main/java/com/vietle/mychatapi/MychatapiApplication.java

@@ -24,6 +24,7 @@ public void addCorsMappings(CorsRegistry registry) {
 				registry.addMapping("/**")
 					.allowedOrigins(allowedOrigins)
 					.allowedMethods("GET", "POST", "DELETE", "PUT", "PATCH", "OPTIONS")
+					.allowedHeaders("*")
 					.allowCredentials(true);
 			}
 		};