عیب‌یابی لاگ‌ها

این نمونه، اطلاعاتی برای رفع مشکل و دیباگ پاسخ‌های خطا به سرویس لاگ ارسال می‌کند.

addEventListener("fetch", (event) => {
    event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  // Service configured to receive logs
  const LOG_URL = "https://log-service.example.com/";

  async function postLog(data) {
    return await fetch(LOG_URL, {
      method: "POST",
      body: data,
    });
  }

  let response;

  try {
    response = await fetch(request);
    if (!response.ok && !response.redirected) {
      const body = await response.text();
      throw new Error(
        "Bad response at origin. Status: " +
          response.status +
          " Body: " +
          // Ensure the string is small enough to be a header
          body.trim().substring(0, 10)
      );
    }
  } catch (err) {

    const stack = JSON.stringify(err.stack) || err;
    // Copy the response and initialize body to the stack trace
    response = new Response(stack, response);
    // Add the error stack into a header to find out what happened
    response.headers.set("X-Debug-stack", stack);
    response.headers.set("X-Debug-err", err);
  }
  return response;
}