如何使用serveFile在Deno中提供文件？

import { serveFile } from "https://deno.land/std/http/file_server.ts";

const server = Deno.listen({ port: 8000 });
console.log("Server is running on port 8000");

for await (const conn of server) {
  (async () => {
    const httpConn = Deno.serveHttp(conn);
    for await (const requestEvent of httpConn) {
      const { request, respondWith } = requestEvent;
      
      // 检查请求路径是否为文件路径
      if (request.url.startsWith("/files/")) {
        const filePath = request.url.substr(7); // 去除路径中的"/files/"
        
        // 使用serveFile函数提供文件
        await respondWith(serveFile(request, filePath));
      } else {
        // 处理其他请求
        // ...
      }
    }
  })();
}