test：添加WebSocket连接诊断和测试工具集

- test_zulip.js: Zulip集成功能的端到端测试脚本
- full_diagnosis.js: 全面的WebSocket连接诊断工具
- test_protocol_difference.js: 不同协议(ws/wss/http/https)的对比测试
- test_redirect_and_websocket.js: HTTP重定向和WebSocket升级测试
- test_websocket_handshake_redirect.js: WebSocket握手重定向机制验证
- websocket_with_redirect_support.js: 支持重定向的WebSocket连接实现

提供完整的WebSocket连接问题诊断和解决方案

test_protocol_difference.js

@@ -0,0 +1,117 @@
+const io = require('socket.io-client');
+
+console.log('🔍 测试不同WebSocket协议的差异');
+console.log('='.repeat(50));
+
+async function testProtocol(name, url, options) {
+  console.log(`\n🧪 测试: ${name}`);
+  console.log(`📡 URL: ${url}`);
+  
+  return new Promise((resolve) => {
+    const socket = io(url, options);
+    let resolved = false;
+    
+    const timeout = setTimeout(() => {
+      if (!resolved) {
+        resolved = true;
+        socket.disconnect();
+        console.log('   ❌ 连接超时');
+        resolve({ success: false, error: 'timeout' });
+      }
+    }, 8000);
+    
+    socket.on('connect', () => {
+      if (!resolved) {
+        resolved = true;
+        clearTimeout(timeout);
+        console.log('   ✅ 连接成功');
+        console.log(`   📡 Socket ID: ${socket.id}`);
+        console.log(`   🚀 传输方式: ${socket.io.engine.transport.name}`);
+        console.log(`   🔗 实际URL: ${socket.io.uri}`);
+        
+        socket.disconnect();
+        resolve({ 
+          success: true, 
+          transport: socket.io.engine.transport.name,
+          actualUrl: socket.io.uri
+        });
+      }
+    });
+    
+    socket.on('connect_error', (error) => {
+      if (!resolved) {
+        resolved = true;
+        clearTimeout(timeout);
+        console.log(`   ❌ 连接失败: ${error.message}`);
+        console.log(`   🔍 错误类型: ${error.type || 'unknown'}`);
+        resolve({ success: false, error: error.message, type: error.type });
+      }
+    });
+  });
+}
+
+async function runProtocolTests() {
+  const tests = [
+    {
+      name: 'WS协议 (错误方式)',
+      url: 'ws://whaletownend.xinghangee.icu/game',
+      options: { transports: ['websocket'], timeout: 5000 }
+    },
+    {
+      name: 'WSS协议 (直接指定)',
+      url: 'wss://whaletownend.xinghangee.icu/game',
+      options: { transports: ['websocket'], timeout: 5000 }
+    },
+    {
+      name: 'HTTPS协议 (推荐方式)',
+      url: 'https://whaletownend.xinghangee.icu/game',
+      options: { transports: ['websocket', 'polling'], timeout: 5000 }
+    },
+    {
+      name: 'HTTP协议 (本地测试)',
+      url: 'http://localhost:3000/game',
+      options: { transports: ['websocket', 'polling'], timeout: 5000 }
+    }
+  ];
+  
+  const results = [];
+  
+  for (const test of tests) {
+    const result = await testProtocol(test.name, test.url, test.options);
+    results.push({ ...test, result });
+    
+    // 等待1秒再测试下一个
+    await new Promise(resolve => setTimeout(resolve, 1000));
+  }
+  
+  console.log('\n' + '='.repeat(50));
+  console.log('📊 协议测试结果对比');
+  console.log('='.repeat(50));
+  
+  results.forEach((test, index) => {
+    const status = test.result.success ? '✅ 成功' : '❌ 失败';
+    const transport = test.result.transport ? ` (${test.result.transport})` : '';
+    const error = test.result.error ? ` - ${test.result.error}` : '';
+    
+    console.log(`${index + 1}. ${test.name}: ${status}${transport}${error}`);
+    
+    if (test.result.actualUrl) {
+      console.log(`   实际连接: ${test.result.actualUrl}`);
+    }
+  });
+  
+  console.log('\n💡 协议选择建议:');
+  console.log('✅ 推荐: 使用 https:// 让Socket.IO自动处理协议选择');
+  console.log('⚠️  避免: 直接使用 ws:// 或 wss://，容易出错');
+  console.log('🔧 本地: 使用 http:// 进行本地开发测试');
+  
+  console.log('\n📚 协议说明:');
+  console.log('• ws://  - WebSocket over HTTP (明文传输)');
+  console.log('• wss:// - WebSocket over HTTPS (加密传输)');
+  console.log('• http://  → Socket.IO自动选择 ws:// 或 polling');
+  console.log('• https:// → Socket.IO自动选择 wss:// 或 polling');
+  
+  process.exit(0);
+}
+
+runProtocolTests().catch(console.error);