feat(web-app): add verification available connection to backend for the http client

web-app/src/Services/HttpClient.ts

@@ -0,0 +1,31 @@
+import axios from "axios";
+
+const BASE = "https://";
+const PING = "ping";
+const RACLETTE = "raclette";
+const PONG = "pong";
+
+export class HttpClient {
+  private _url: string;
+
+  constructor(url: string) {
+    this._url = url;
+  }
+
+  async isConnected(): Promise<boolean> {
+    var connected = false;
+    if (await this.ping()) {
+      connected = true;
+      console.log("Connected to backend!");
+    } else {
+      connected = false;
+      console.log("Connection failed backend!");
+    }
+    return connected;
+  }
+
+  private async ping(): Promise<string> {
+    const response = await axios.get(`${BASE}${this._url}/${PING}`);
+    return response.data;
+  }
+}