server-timing.gif

nodejs 示例代码

const headers = {
    'Server-Timing': `
        lb=18; "Load Balancer",
        server-3=104; "Server #3 Startup",
        db-read=187; "Database Read",
        aws-download=317; "AWS Content Download",
        db-write=218; "Database Write",
        templating=48; "Templating plugin"
    `.replace(/\n/g, '')
};

response.writeHead(200, headers);

补充

后台这里应该有对应的中间件实现,有兴趣的老铁可以自行搜索下