Completed first revision of front end. Enabled CORS in spring. Allowed path variable to be optional.

backend/src/main/java/achievements/Application.java

@@ -3,6 +3,9 @@ package achievements;
 import achievements.services.DbConnectionService;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 @SpringBootApplication
 public class Application {
@@ -16,4 +19,16 @@ public class Application {
 			SpringApplication.exit(context, () -> 0);
 		}
 	}
+
+	@Bean
+	public WebMvcConfigurer configurer() {
+		return new WebMvcConfigurer() {
+			@Override
+			public void addCorsMappings(CorsRegistry registry) {
+				registry
+					.addMapping("/*")
+					.allowedOrigins("*");
+			}
+		};
+	}
 }