From 65af8ba635ed9832405f4226fe8697ab010b0d6f Mon Sep 17 00:00:00 2001
From: Sunwuyuan <sun@wuyuan.dev>
Date: Sat, 6 Dec 2025 12:03:01 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=9B=B4=E6=96=B0=20Socket.IO=20?=
 =?UTF-8?q?=E5=AE=A2=E6=88=B7=E7=AB=AF=EF=BC=8C=E6=94=AF=E6=8C=81=E5=A4=9A?=
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---
 src/pages/socket-debugger.vue | 807 ++++++++++++++++++++++++++++++++++
 src/utils/socketClient.js     |   2 +-
 2 files changed, 808 insertions(+), 1 deletion(-)
 create mode 100644 src/pages/socket-debugger.vue

diff --git a/src/pages/socket-debugger.vue b/src/pages/socket-debugger.vue
new file mode 100644
index 0000000..1e1f288
--- /dev/null
+++ b/src/pages/socket-debugger.vue
@@ -0,0 +1,807 @@
+<template>
+  <v-container fluid>
+    <v-row>
+      <!-- 标题栏 -->
+      <v-col cols="12">
+        <v-card border>
+          <v-card-title class="d-flex align-center">
+            <v-icon class="mr-2" color="primary">mdi-network</v-icon>
+            Socket.IO 连接调试器
+            <v-spacer />
+            <v-chip :color="connectionStatus.color" size="small">
+              {{ connectionStatus.text }}
+            </v-chip>
+          </v-card-title>
+        </v-card>
+      </v-col>
+
+      <!-- 连接信息卡片 -->
+      <v-col cols="12" md="6">
+        <v-card border>
+          <v-card-title>连接信息</v-card-title>
+          <v-card-text>
+            <v-list density="compact">
+              <v-list-item>
+                <template #prepend>
+                  <v-icon>mdi-server</v-icon>
+                </template>
+                <v-list-item-title>服务器地址</v-list-item-title>
+                <v-list-item-subtitle>{{ serverUrl }}</v-list-item-subtitle>
+              </v-list-item>
+
+              <v-list-item>
+                <template #prepend>
+                  <v-icon>mdi-identifier</v-icon>
+                </template>
+                <v-list-item-title>Socket ID</v-list-item-title>
+                <v-list-item-subtitle>{{ socketId || '未连接' }}</v-list-item-subtitle>
+              </v-list-item>
+
+              <v-list-item>
+                <template #prepend>
+                  <v-icon>mdi-transit-connection-variant</v-icon>
+                </template>
+                <v-list-item-title>传输方式</v-list-item-title>
+                <v-list-item-subtitle>
+                  <v-chip size="x-small" :color="transportColor">
+                    {{ transport || '未知' }}
+                  </v-chip>
+                </v-list-item-subtitle>
+              </v-list-item>
+
+              <v-list-item>
+                <template #prepend>
+                  <v-icon>mdi-clock-outline</v-icon>
+                </template>
+                <v-list-item-title>连接时长</v-list-item-title>
+                <v-list-item-subtitle>{{ connectionDuration }}</v-list-item-subtitle>
+              </v-list-item>
+
+              <v-list-item>
+                <template #prepend>
+                  <v-icon>mdi-refresh</v-icon>
+                </template>
+                <v-list-item-title>重连次数</v-list-item-title>
+                <v-list-item-subtitle>{{ reconnectCount }}</v-list-item-subtitle>
+              </v-list-item>
+
+              <v-list-item>
+                <template #prepend>
+                  <v-icon>mdi-calendar-clock</v-icon>
+                </template>
+                <v-list-item-title>上次连接</v-list-item-title>
+                <v-list-item-subtitle>{{ lastConnectedTime || '从未连接' }}</v-list-item-subtitle>
+              </v-list-item>
+            </v-list>
+
+            <v-divider class="my-4" />
+
+            <div class="d-flex flex-wrap gap-2">
+              <v-btn
+                color="primary"
+                prepend-icon="mdi-connection"
+                :disabled="isConnected"
+                @click="handleConnect"
+              >
+                连接
+              </v-btn>
+              <v-btn
+                color="error"
+                prepend-icon="mdi-connection"
+                :disabled="!isConnected"
+                @click="handleDisconnect"
+              >
+                断开
+              </v-btn>
+              <v-btn
+                color="warning"
+                prepend-icon="mdi-refresh"
+                @click="handleReconnect"
+              >
+                重连
+              </v-btn>
+              <v-btn
+                color="info"
+                prepend-icon="mdi-delete-sweep"
+                @click="clearLogs"
+              >
+                清空日志
+              </v-btn>
+            </div>
+          </v-card-text>
+        </v-card>
+      </v-col>
+
+      <!-- 统计信息卡片 -->
+      <v-col cols="12" md="6">
+        <v-card border>
+          <v-card-title>统计信息</v-card-title>
+          <v-card-text>
+            <v-row>
+              <v-col cols="6">
+                <v-card variant="tonal" color="success">
+                  <v-card-text class="text-center">
+                    <div class="text-h4">{{ stats.eventsReceived }}</div>
+                    <div class="text-caption">接收事件</div>
+                  </v-card-text>
+                </v-card>
+              </v-col>
+              <v-col cols="6">
+                <v-card variant="tonal" color="primary">
+                  <v-card-text class="text-center">
+                    <div class="text-h4">{{ stats.eventsSent }}</div>
+                    <div class="text-caption">发送事件</div>
+                  </v-card-text>
+                </v-card>
+              </v-col>
+              <v-col cols="6">
+                <v-card variant="tonal" color="warning">
+                  <v-card-text class="text-center">
+                    <div class="text-h4">{{ stats.errors }}</div>
+                    <div class="text-caption">错误次数</div>
+                  </v-card-text>
+                </v-card>
+              </v-col>
+              <v-col cols="6">
+                <v-card variant="tonal" color="info">
+                  <v-card-text class="text-center">
+                    <div class="text-h4">{{ stats.reconnects }}</div>
+                    <div class="text-caption">重连次数</div>
+                  </v-card-text>
+                </v-card>
+              </v-col>
+            </v-row>
+
+            <v-divider class="my-4" />
+
+            <v-list density="compact">
+              <v-list-item>
+                <v-list-item-title>平均延迟</v-list-item-title>
+                <v-list-item-subtitle>{{ stats.avgLatency }} ms</v-list-item-subtitle>
+              </v-list-item>
+              <v-list-item>
+                <v-list-item-title>上次 Ping</v-list-item-title>
+                <v-list-item-subtitle>{{ stats.lastPing }} ms</v-list-item-subtitle>
+              </v-list-item>
+              <v-list-item>
+                <v-list-item-title>数据传输</v-list-item-title>
+                <v-list-item-subtitle>
+                  ↑ {{ formatBytes(stats.bytesSent) }} / ↓ {{ formatBytes(stats.bytesReceived) }}
+                </v-list-item-subtitle>
+              </v-list-item>
+            </v-list>
+          </v-card-text>
+        </v-card>
+      </v-col>
+
+      <!-- 事件监控 -->
+      <v-col cols="12" md="6">
+        <v-card border>
+          <v-card-title>
+            事件监控
+            <v-chip class="ml-2" size="small">{{ activeListeners.size }} 个监听器</v-chip>
+          </v-card-title>
+          <v-card-text>
+            <v-list density="compact" max-height="300" style="overflow-y: auto">
+              <v-list-item v-if="activeListeners.size === 0">
+                <v-list-item-title class="text-center text-disabled">
+                  暂无活动监听器
+                </v-list-item-title>
+              </v-list-item>
+              <v-list-item
+                v-for="listener in Array.from(activeListeners)"
+                :key="listener"
+              >
+                <template #prepend>
+                  <v-icon size="small">mdi-eye</v-icon>
+                </template>
+                <v-list-item-title>{{ listener }}</v-list-item-title>
+              </v-list-item>
+            </v-list>
+          </v-card-text>
+        </v-card>
+      </v-col>
+
+      <!-- 自定义事件发送 -->
+      <v-col cols="12" md="6">
+        <v-card border>
+          <v-card-title>发送自定义事件</v-card-title>
+          <v-card-text>
+            <v-text-field
+              v-model="customEvent.name"
+              label="事件名称"
+              prepend-icon="mdi-tag"
+              density="compact"
+              class="mb-2"
+            />
+            <v-textarea
+              v-model="customEvent.data"
+              label="数据 (JSON)"
+              prepend-icon="mdi-code-json"
+              rows="4"
+              density="compact"
+              class="mb-2"
+            />
+            <v-btn
+              block
+              color="primary"
+              prepend-icon="mdi-send"
+              :disabled="!isConnected || !customEvent.name"
+              @click="sendCustomEvent"
+            >
+              发送事件
+            </v-btn>
+          </v-card-text>
+        </v-card>
+      </v-col>
+
+      <!-- 连接日志 -->
+      <v-col cols="12">
+        <v-card border>
+          <v-card-title class="d-flex align-center">
+            连接日志
+            <v-spacer />
+            <v-switch
+              v-model="autoScroll"
+              label="自动滚动"
+              density="compact"
+              hide-details
+              class="mr-4"
+            />
+            <v-btn
+              size="small"
+              variant="text"
+              prepend-icon="mdi-download"
+              @click="exportLogs"
+            >
+              导出
+            </v-btn>
+          </v-card-title>
+          <v-card-text>
+            <div
+              ref="logContainer"
+              class="log-container"
+              style="height: 400px; overflow-y: auto; background: #1e1e1e; border-radius: 4px; padding: 12px;"
+            >
+              <div
+                v-for="(log, index) in logs"
+                :key="index"
+                class="log-entry"
+                :class="`log-${log.type}`"
+              >
+                <span class="log-time">[{{ log.time }}]</span>
+                <span class="log-type">[{{ log.type.toUpperCase() }}]</span>
+                <span class="log-message">{{ log.message }}</span>
+                <pre v-if="log.data" class="log-data">{{ log.data }}</pre>
+              </div>
+              <div v-if="logs.length === 0" class="text-center text-disabled pa-8">
+                暂无日志
+              </div>
+            </div>
+          </v-card-text>
+        </v-card>
+      </v-col>
+
+      <!-- 诊断工具 -->
+      <v-col cols="12">
+        <v-card border>
+          <v-card-title>连接诊断</v-card-title>
+          <v-card-text>
+            <v-row>
+              <v-col cols="12" md="4">
+                <v-btn
+                  block
+                  color="info"
+                  prepend-icon="mdi-test-tube"
+                  @click="testConnection"
+                >
+                  测试连接
+                </v-btn>
+              </v-col>
+              <v-col cols="12" md="4">
+                <v-btn
+                  block
+                  color="success"
+                  prepend-icon="mdi-timer"
+                  :disabled="!isConnected"
+                  @click="measureLatency"
+                >
+                  测量延迟
+                </v-btn>
+              </v-col>
+              <v-col cols="12" md="4">
+                <v-btn
+                  block
+                  color="warning"
+                  prepend-icon="mdi-alert"
+                  @click="simulateError"
+                >
+                  模拟错误
+                </v-btn>
+              </v-col>
+            </v-row>
+
+            <v-alert
+              v-if="diagnosticResult"
+              :type="diagnosticResult.type"
+              class="mt-4"
+              closable
+              @click:close="diagnosticResult = null"
+            >
+              {{ diagnosticResult.message }}
+            </v-alert>
+          </v-card-text>
+        </v-card>
+      </v-col>
+    </v-row>
+  </v-container>
+</template>
+
+<script setup>
+import { ref, computed, onMounted, onUnmounted, nextTick } from 'vue';
+import { getSocket, getServerUrl, disconnect, on, off } from '@/utils/socketClient';
+
+// 状态数据
+const serverUrl = ref(getServerUrl());
+const isConnected = ref(false);
+const socketId = ref('');
+const transport = ref('');
+const reconnectCount = ref(0);
+const lastConnectedTime = ref('');
+const connectionStartTime = ref(null);
+const connectionDuration = ref('00:00:00');
+const autoScroll = ref(true);
+
+// 统计数据
+const stats = ref({
+  eventsReceived: 0,
+  eventsSent: 0,
+  errors: 0,
+  reconnects: 0,
+  avgLatency: 0,
+  lastPing: 0,
+  bytesSent: 0,
+  bytesReceived: 0,
+});
+
+// 日志和监听器
+const logs = ref([]);
+const activeListeners = ref(new Set());
+const logContainer = ref(null);
+
+// 自定义事件
+const customEvent = ref({
+  name: '',
+  data: '{}',
+});
+
+// 诊断结果
+const diagnosticResult = ref(null);
+
+// 计算属性
+const connectionStatus = computed(() => {
+  if (isConnected.value) {
+    return { text: '已连接', color: 'success' };
+  }
+  return { text: '未连接', color: 'error' };
+});
+
+const transportColor = computed(() => {
+  if (transport.value === 'websocket') return 'success';
+  if (transport.value === 'polling') return 'warning';
+  return 'grey';
+});
+
+// 日志函数
+function addLog(type, message, data = null) {
+  const now = new Date();
+  const time = now.toLocaleTimeString('zh-CN', { hour12: false });
+  logs.value.push({ type, message, data, time });
+
+  // 限制日志数量
+  if (logs.value.length > 500) {
+    logs.value.shift();
+  }
+
+  if (autoScroll.value) {
+    nextTick(() => {
+      if (logContainer.value) {
+        logContainer.value.scrollTop = logContainer.value.scrollHeight;
+      }
+    });
+  }
+}
+
+function clearLogs() {
+  logs.value = [];
+  addLog('info', '日志已清空');
+}
+
+// 格式化字节
+function formatBytes(bytes) {
+  if (bytes === 0) return '0 B';
+  const k = 1024;
+  const sizes = ['B', 'KB', 'MB', 'GB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
+}
+
+// 更新连接时长
+let durationInterval = null;
+function updateConnectionDuration() {
+  if (connectionStartTime.value) {
+    const now = Date.now();
+    const diff = now - connectionStartTime.value;
+    const hours = Math.floor(diff / 3600000);
+    const minutes = Math.floor((diff % 3600000) / 60000);
+    const seconds = Math.floor((diff % 60000) / 1000);
+    connectionDuration.value = `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`;
+  } else {
+    connectionDuration.value = '00:00:00';
+  }
+}
+
+// 存储事件处理器引用,用于清理
+let eventHandlers = null;
+
+// Socket 事件处理
+function setupSocketListeners() {
+  const socket = getSocket();
+
+  // 如果已有事件处理器,先清理
+  if (eventHandlers) {
+    cleanupSocketListeners();
+  }
+
+  // 连接事件
+  const onConnect = () => {
+    isConnected.value = true;
+    socketId.value = socket.id;
+    transport.value = socket.io?.engine?.transport?.name || 'unknown';
+    connectionStartTime.value = Date.now();
+    lastConnectedTime.value = new Date().toLocaleString('zh-CN');
+    addLog('success', '已连接到服务器', { socketId: socket.id, transport: transport.value });
+
+    if (!durationInterval) {
+      durationInterval = setInterval(updateConnectionDuration, 1000);
+    }
+  };
+
+  const onDisconnect = (reason) => {
+    isConnected.value = false;
+    socketId.value = '';
+    transport.value = '';
+    connectionStartTime.value = null;
+    addLog('warning', '连接已断开', { reason });
+
+    if (durationInterval) {
+      clearInterval(durationInterval);
+      durationInterval = null;
+    }
+  };
+
+  const onConnectError = (error) => {
+    stats.value.errors++;
+    addLog('error', '连接错误', { message: error.message, type: error.type });
+  };
+
+  const onReconnect = (attempt) => {
+    stats.value.reconnects++;
+    reconnectCount.value++;
+    addLog('info', `重连成功 (尝试 #${attempt})`);
+  };
+
+  const onReconnectAttempt = (attempt) => {
+    addLog('info', `正在尝试重连 #${attempt}...`);
+  };
+
+  const onReconnectError = (error) => {
+    stats.value.errors++;
+    addLog('error', '重连失败', { message: error.message });
+  };
+
+  const onReconnectFailed = () => {
+    stats.value.errors++;
+    addLog('error', '重连彻底失败');
+  };
+
+  const onPing = () => {
+    addLog('debug', 'Ping 发送');
+  };
+
+  const onPong = (latency) => {
+    stats.value.lastPing = latency;
+    const prevAvg = stats.value.avgLatency;
+    stats.value.avgLatency = prevAvg === 0 ? latency : Math.round((prevAvg * 0.8 + latency * 0.2));
+    addLog('debug', `Pong 接收 (${latency}ms)`);
+  };
+
+  const onUpgrade = (newTransport) => {
+    transport.value = newTransport.name;
+    addLog('success', `传输已升级到 ${newTransport.name}`);
+  };
+
+  // 保存事件处理器引用
+  eventHandlers = {
+    socket,
+    onConnect,
+    onDisconnect,
+    onConnectError,
+    onReconnect,
+    onReconnectAttempt,
+    onReconnectError,
+    onReconnectFailed,
+    onPing,
+    onPong,
+    onUpgrade,
+  };
+
+  // 绑定事件
+  socket.on('connect', onConnect);
+  socket.on('disconnect', onDisconnect);
+  socket.on('connect_error', onConnectError);
+  socket.io.on('reconnect', onReconnect);
+  socket.io.on('reconnect_attempt', onReconnectAttempt);
+  socket.io.on('reconnect_error', onReconnectError);
+  socket.io.on('reconnect_failed', onReconnectFailed);
+  socket.io.on('ping', onPing);
+  socket.io.on('pong', onPong);
+
+  // 监听传输升级
+  if (socket.io?.engine) {
+    socket.io.engine.on('upgrade', onUpgrade);
+  }
+
+  // 更新活动监听器列表
+  activeListeners.value = new Set(Object.keys(socket._callbacks || {}).map(k => k.replace('$', '')));
+
+  // 初始状态
+  if (socket.connected) {
+    onConnect();
+  }
+}
+
+// 清理 Socket 事件监听器
+function cleanupSocketListeners() {
+  if (!eventHandlers) return;
+
+  const { socket, onConnect, onDisconnect, onConnectError, onReconnect,
+          onReconnectAttempt, onReconnectError, onReconnectFailed, onPing, onPong, onUpgrade } = eventHandlers;
+
+  try {
+    socket.off('connect', onConnect);
+    socket.off('disconnect', onDisconnect);
+    socket.off('connect_error', onConnectError);
+    socket.io.off('reconnect', onReconnect);
+    socket.io.off('reconnect_attempt', onReconnectAttempt);
+    socket.io.off('reconnect_error', onReconnectError);
+    socket.io.off('reconnect_failed', onReconnectFailed);
+    socket.io.off('ping', onPing);
+    socket.io.off('pong', onPong);
+
+    if (socket.io?.engine) {
+      socket.io.engine.off('upgrade', onUpgrade);
+    }
+  } catch (e) {
+    // 忽略清理错误
+  }
+
+  eventHandlers = null;
+}
+
+// 连接控制
+function handleConnect() {
+  try {
+    const socket = getSocket();
+    socket.connect();
+    addLog('info', '正在连接...');
+  } catch (error) {
+    addLog('error', '连接失败', { message: error.message });
+  }
+}
+
+function handleDisconnect() {
+  try {
+    disconnect();
+    addLog('info', '已手动断开连接');
+  } catch (error) {
+    addLog('error', '断开连接失败', { message: error.message });
+  }
+}
+
+function handleReconnect() {
+  try {
+    disconnect();
+    setTimeout(() => {
+      // 重新初始化并设置监听器
+      setupSocketListeners();
+      handleConnect();
+    }, 100);
+  } catch (error) {
+    addLog('error', '重连失败', { message: error.message });
+  }
+}
+
+// 发送自定义事件
+function sendCustomEvent() {
+  try {
+    const socket = getSocket();
+    let data;
+    try {
+      data = JSON.parse(customEvent.value.data);
+    } catch {
+      data = customEvent.value.data;
+    }
+
+    socket.emit(customEvent.value.name, data);
+    stats.value.eventsSent++;
+    stats.value.bytesSent += JSON.stringify(data).length;
+    addLog('info', `已发送事件: ${customEvent.value.name}`, data);
+  } catch (error) {
+    addLog('error', '发送事件失败', { message: error.message });
+  }
+}
+
+// 诊断工具
+function testConnection() {
+  diagnosticResult.value = null;
+  addLog('info', '开始连接测试...');
+
+  const socket = getSocket();
+  const timeout = setTimeout(() => {
+    diagnosticResult.value = {
+      type: 'error',
+      message: '连接测试超时 (20秒)',
+    };
+    addLog('error', '连接测试超时');
+  }, 20000);
+
+  if (socket.connected) {
+    clearTimeout(timeout);
+    diagnosticResult.value = {
+      type: 'success',
+      message: `连接正常! Socket ID: ${socket.id}, 传输: ${transport.value}`,
+    };
+    addLog('success', '连接测试通过');
+  } else {
+    socket.once('connect', () => {
+      clearTimeout(timeout);
+      diagnosticResult.value = {
+        type: 'success',
+        message: '连接测试成功!',
+      };
+      addLog('success', '连接测试通过');
+    });
+
+    socket.once('connect_error', (error) => {
+      clearTimeout(timeout);
+      diagnosticResult.value = {
+        type: 'error',
+        message: `连接失败: ${error.message}`,
+      };
+      addLog('error', '连接测试失败', { message: error.message });
+    });
+  }
+}
+
+function measureLatency() {
+  const socket = getSocket();
+  const start = Date.now();
+
+  socket.emit('ping', () => {
+    const latency = Date.now() - start;
+    diagnosticResult.value = {
+      type: 'info',
+      message: `测量延迟: ${latency}ms`,
+    };
+    addLog('info', `延迟测量结果: ${latency}ms`);
+  });
+}
+
+function simulateError() {
+  addLog('warning', '模拟错误场景...');
+  const socket = getSocket();
+
+  // 发送一个不存在的事件
+  socket.emit('nonexistent-event-test', { test: true });
+
+  diagnosticResult.value = {
+    type: 'info',
+    message: '已发送测试事件到服务器,请检查服务器响应',
+  };
+}
+
+// 导出日志
+function exportLogs() {
+  const content = logs.value
+    .map(log => `[${log.time}] [${log.type.toUpperCase()}] ${log.message}${log.data ? '\n' + JSON.stringify(log.data, null, 2) : ''}`)
+    .join('\n\n');
+
+  const blob = new Blob([content], { type: 'text/plain' });
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement('a');
+  a.href = url;
+  a.download = `socket-logs-${Date.now()}.txt`;
+  a.click();
+  URL.revokeObjectURL(url);
+
+  addLog('success', '日志已导出');
+}
+
+// 生命周期
+onMounted(() => {
+  setupSocketListeners();
+  addLog('info', 'Socket 调试器已初始化');
+});
+
+onUnmounted(() => {
+  cleanupSocketListeners();
+  if (durationInterval) {
+    clearInterval(durationInterval);
+    durationInterval = null;
+  }
+});
+</script>
+
+<style scoped>
+.log-container {
+  font-family: 'Courier New', monospace;
+  font-size: 12px;
+  line-height: 1.6;
+}
+
+.log-entry {
+  margin-bottom: 8px;
+  padding: 4px 8px;
+  border-radius: 4px;
+}
+
+.log-time {
+  color: #858585;
+  margin-right: 8px;
+}
+
+.log-type {
+  font-weight: bold;
+  margin-right: 8px;
+}
+
+.log-success .log-type {
+  color: #4caf50;
+}
+
+.log-error .log-type {
+  color: #f44336;
+}
+
+.log-warning .log-type {
+  color: #ff9800;
+}
+
+.log-info .log-type {
+  color: #2196f3;
+}
+
+.log-debug .log-type {
+  color: #9e9e9e;
+}
+
+.log-message {
+  color: #e0e0e0;
+}
+
+.log-data {
+  margin-top: 4px;
+  margin-left: 24px;
+  padding: 8px;
+  background: #2d2d2d;
+  border-radius: 4px;
+  color: #b0b0b0;
+  font-size: 11px;
+  overflow-x: auto;
+}
+
+.gap-2 {
+  gap: 8px;
+}
+</style>
diff --git a/src/utils/socketClient.js b/src/utils/socketClient.js
index 432f7ba..f02d6a1 100644
--- a/src/utils/socketClient.js
+++ b/src/utils/socketClient.js
@@ -28,7 +28,7 @@ export function getSocket() {
       socket = null;
     }
     connectedDomain = serverUrl;
-    socket = io(serverUrl, {transports: ['websocket']});
+    socket = io(serverUrl, {transports:  ["polling","websocket"]});
 
     // Re-attach previously registered event handlers on new socket instance
     listeners.forEach(({event, handler}) => {