Modified manager to new design

manager/javascripts/net.js

@@ -11,4 +11,22 @@ function checkPort(port, callback) {
     });
 }
 
-module.exports = checkPort;
+async function fetchWithTimeout(resource, options = {}) {
+    const { timeout = 8000 } = options;
+    
+    const controller = new AbortController();
+    const id = setTimeout(() => controller.abort(), timeout);
+  
+    const response = await fetch(resource, {
+      ...options,
+      signal: controller.signal  
+    });
+    clearTimeout(id);
+  
+    return response;
+}
+
+module.exports = {
+    checkPort: checkPort,
+    fetchWithTimeout: fetchWithTimeout
+}