Merge branch 'master' into urls

# Conflicts:
#	frontend/src/lang/en.json

backend/dockge-server.ts

@@ -195,6 +195,7 @@ export class DockgeServer {
         // Create Socket.io
         this.io = new socketIO.Server(this.httpServer, {
             cors,
+            transports: [ "websocket" ],
         });
 
         this.io.on("connection", async (socket: Socket) => {

frontend/src/lang/en.json

@@ -92,5 +92,10 @@
     "Internal Networks": "Internal Networks",
     "External Networks": "External Networks",
     "No External Networks": "No External Networks",
+    "reverseProxyMsg1": "Using a Reverse Proxy?",
+    "reverseProxyMsg2": "Check how to config it for WebSocket",
+    "Cannot connect to the socket server.": "Cannot connect to the socket server.",
+    "reconnecting...": "Reconnecting...",
+    "connecting...": "Connecting to the socket server...",
     "url": "URL | URLs"
 }

frontend/src/layouts/Layout.vue

@@ -3,6 +3,9 @@
         <div v-if="! $root.socketIO.connected && ! $root.socketIO.firstConnect" class="lost-connection">
             <div class="container-fluid">
                 {{ $root.socketIO.connectionErrorMsg }}
+                <div v-if="$root.socketIO.showReverseProxyGuide">
+                    {{ $t("reverseProxyMsg1") }} <a href="https://github.com/louislam/uptime-kuma/wiki/Reverse-Proxy" target="_blank">{{ $t("reverseProxyMsg2") }}</a>
+                </div>
             </div>
         </div>
 
@@ -82,6 +85,10 @@
         </header>
 
         <main>
+            <div v-if="$root.socketIO.connecting" class="container mt-5">
+                <h4>{{ $t("connecting...") }}</h4>
+            </div>
+
             <router-view v-if="$root.loggedIn" />
             <Login v-if="! $root.loggedIn && $root.allowLoginDialog" />
         </main>

frontend/src/mixins/socket.ts

@@ -19,6 +19,7 @@ export default defineComponent({
                 initedSocketIO: false,
                 connectionErrorMsg: `${this.$t("Cannot connect to the socket server.")} ${this.$t("Reconnecting...")}`,
                 showReverseProxyGuide: true,
+                connecting: false,
             },
             info: {
 
@@ -103,13 +104,20 @@ export default defineComponent({
                 url = location.protocol + "//" + location.host;
             }
 
+            let connectingMsgTimeout = setTimeout(() => {
+                this.socketIO.connecting = true;
+            }, 1500);
+
             socket = io(url, {
-                transports: [ "websocket", "polling" ]
+                transports: [ "websocket" ]
             });
 
             socket.on("connect", () => {
                 console.log("Connected to the socket server");
 
+                clearTimeout(connectingMsgTimeout);
+                this.socketIO.connecting = false;
+
                 this.socketIO.connectCount++;
                 this.socketIO.connected = true;
                 this.socketIO.showReverseProxyGuide = false;
@@ -143,10 +151,11 @@ export default defineComponent({
 
             socket.on("connect_error", (err) => {
                 console.error(`Failed to connect to the backend. Socket.io connect_error: ${err.message}`);
-                this.socketIO.connectionErrorMsg = `${this.$t("Cannot connect to the socket server.")} [${err}] ${this.$t("Reconnecting...")}`;
+                this.socketIO.connectionErrorMsg = `${this.$t("Cannot connect to the socket server.")} [${err}] ${this.$t("reconnecting...")}`;
                 this.socketIO.showReverseProxyGuide = true;
                 this.socketIO.connected = false;
                 this.socketIO.firstConnect = false;
+                this.socketIO.connecting = false;
             });
 
             // Custom Events