Server Timing API All In One

Server Timing API 允许您通过响应标头将特定于请求的计时数据从服务器传递到浏览器。
例如，您可以指示在数据库中查找特定请求的数据所花费的时间 - 在调试由于服务器速度缓慢而导致的性能问题时，这可能很有用。

https://www.w3.org/TR/server-timing/

https://w3c.github.io/server-timing/

https://developer.mozilla.org/en-US/docs/Web/API/PerformanceServerTiming

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Server-Timing

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Timing-Allow-Origin

https://caniuse.com/server-timing

demo

使用 Server-Timing 响应标头, 在响应中指定服务器计时数据;

HTTP/1.1 200 OK

Server-Timing: miss, db;dur=53, app;dur=47.2

在页面中，可以从 Resource Timing API 和 Navigation Timing API 的 resource 或 navigation 中读取此数据。

// Catch errors since some browsers throw when using the new `type` option.
// https://bugs.webkit.org/show_bug.cgi?id=209216
try {
  // Create the performance observer.
  const po = new PerformanceObserver((list) => {
    for (const entry of list.getEntries()) { 
      // Logs all server timing data for this response ? entry.serverTiming
      console.log('Server Timing', entry.serverTiming);
    }
  });
  // Start listening for `navigation` entries to be dispatched. ? navigation
  po.observe({type: 'navigation', buffered: true});
} catch (err) {
  // Do nothing if the browser doesn't support this API.
}

PerformanceObserver

Resource Timing API 和 Navigation Timing API

refs

https://web.dev/custom-metrics/#server-timing-api

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