chore (frontend): move url in frontend

public/assets/lib/error.js

@@ -0,0 +1,35 @@
+export class AjaxError extends Error {
+    constructor(message, err = null, code = "UNDEFINED_CODE") {
+        super(message);
+        this.name = this.constructor.name;
+        this.errCode = code;
+        this.errOrig = err;
+    }
+
+    code() {
+        return this.errCode;
+    }
+
+    err() {
+        return this.errOrig;
+    }
+
+    type() {
+        return "AjaxError";
+    }
+}
+
+export class ApplicationError extends Error {
+    constructor(message, debug) {
+        super(message);
+        this.debugMsg = debug;
+    }
+
+    type() {
+        return "ApplicationError";
+    }
+
+    debug() {
+        return this.debugMsg || "N/A";
+    }
+}