perf: 静态路由修改为简单的map缓存

keepalive_issue_demo/README.md

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+# V 语言 HTTP Keep-Alive 问题最小复现
+
+## 问题描述
+
+V 语言标准库 `net.http.Server` 不支持 HTTP Keep-Alive 连接复用。
+每次请求处理完成后，服务器会立即关闭 TCP 连接。
+
+## 运行方式
+
+### 1. 启动服务器
+```bash
+v run server.v
+```
+
+### 2. 运行客户端测试（新终端）
+```bash
+v run client.v
+```
+
+## 预期 vs 实际
+
+| 请求 | 预期 (Keep-Alive 正常) | 实际 (V 当前行为) |
+|------|------------------------|-------------------|
+| #1   | ~300ms (新连接)        | ~300ms            |
+| #2   | ~1-10ms (复用)         | ~300ms            |
+| #3   | ~1-10ms (复用)         | ~300ms            |
+| #4   | ~1-10ms (复用)         | ~300ms            |
+| #5   | ~1-10ms (复用)         | ~300ms            |
+
+## 根本原因
+
+`vlib/net/http/server.v` 中的 `handle_conn` 函数：
+
+```v
+fn (mut w HandlerWorker) handle_conn(mut conn net.TcpConn) {
+    defer {
+        conn.close() or { ... }  // <-- 每次请求后关闭连接
+    }
+    // 只处理单个请求，然后关闭
+}
+```
+
+## 临时解决方案
+
+在 V 服务器前部署 nginx 等反向代理来处理 Keep-Alive。

keepalive_issue_demo/client.v

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+// Minimal client example - Test Keep-Alive connection reuse
+module main
+
+import net.http
+import time
+
+fn main() {
+	println('=== V HTTP Keep-Alive Issue Demo ===\n')
+	println('Sending 5 consecutive requests, observe the time for each...\n')
+	
+	url := 'http://127.0.0.1:8080/'
+	
+	for i in 1 .. 6 {
+		start := time.now()
+		
+		resp := http.get(url) or {
+			println('Request failed: ${err}')
+			continue
+		}
+		
+		elapsed := time.since(start)
+		println('Request #${i}: ${elapsed.milliseconds()}ms - Status: ${resp.status_code}')
+	}
+	
+	println('\n--- Analysis ---')
+	println('If Keep-Alive works correctly:')
+	println('  - First request: ~300ms (establish TCP connection)')
+	println('  - Subsequent requests: ~1-10ms (reuse connection)')
+	println('')
+	println('Actual behavior (V language current):')
+	println('  - Every request takes ~300ms (reconnect each time)')
+	println('')
+	println('Reason: net.http.Server calls conn.close() after each request')
+}

keepalive_issue_demo/server.v

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+// Minimal server example - Demonstrate Keep-Alive issue
+module main
+
+import net.http
+import time
+
+struct MyHandler {}
+
+fn (_ MyHandler) handle(req http.Request) http.Response {
+	now := time.now()
+	println('[${now.format_ss_micro()}] Received request: ${req.method} ${req.url}')
+	
+	return http.Response{
+		status_code: 200
+		status_msg: 'OK'
+		header: http.new_custom_header_from_map({
+			'Content-Type': 'text/plain'
+			'Connection': 'keep-alive'  // Set but not effective
+		}) or { http.new_header() }
+		body: 'Hello! Time: ${now.format_ss_micro()}'
+	}
+}
+
+fn main() {
+	println('Starting server at http://localhost:8080')
+	println('Server sends Connection: keep-alive in response header')
+	println('But due to V stdlib limitation, connection is still closed')
+	
+	mut server := http.Server{
+		handler: MyHandler{}
+		addr: ':8080'
+	}
+	server.listen_and_serve()
+}