处理远程应用加载失败
学习检测并恢复联邦远程应用因网络错误、版本不匹配或部署问题而无法加载的情况。
处理远程应用加载失败 是 CoddyKit 上的免费 Micro Frontends Architecture with Module Federation 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Micro Frontends Architecture with Module Federation 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Micro Frontends Architecture with Module Federation 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Remotes Can Fail to Load
In federation, a remote is fetched over the network at run time. That fetch can fail: the server is down, the URL is wrong, or a deploy is mid-flight. Your app must handle it.
Failure Modes
Common remote-loading failures include:
- Network timeout fetching
remoteEntry.js - 404 after a remote was redeployed
- Incompatible shared dependency versions
- JavaScript errors during remote bootstrap
Wrapping Dynamic Imports
Because remotes load via import(), you can catch failures with a standard promise catch.
import("cart/App")
.then(m => mount(m.default))
.catch(err => showFallback(err));Providing a Fallback UI
When a remote fails, render a graceful fallback for just that region — the rest of the page keeps working.
function showFallback() {
region.innerHTML = "<p>Cart is temporarily unavailable.</p>";
}Retry with Backoff
Transient failures often succeed on retry. Attempt the import again a few times with increasing delay before giving up.
async function load(retries) {
try { return await import("cart/App"); }
catch (e) {
if (retries > 0) return load(retries - 1);
throw e;
}
}Combining with Error Boundaries
For React, pair the import catch with an error boundary so failures during render (not just loading) also show the fallback instead of crashing the page.
Versioned remoteEntry URLs
404s after deploys often come from overwriting remoteEntry.js in place. Using versioned or content-hashed entry URLs lets old hosts keep loading the version they expect.
/cart/remoteEntry.[contenthash].jsTimeouts for Slow Remotes
A remote that hangs is as bad as one that fails. Race the import against a timeout so users are not stuck waiting indefinitely.
Promise.race([
import("cart/App"),
new Promise((_, r) => setTimeout(() => r(new Error("timeout")), 5000))
]);Degrading Gracefully
Decide per region how critical it is. A missing recommendations widget can simply disappear, while a missing checkout MFE may warrant a prominent error and support link.
Logging Remote Failures
Report which remote failed, the URL, and the error to your monitoring system so the owning team is alerted even if users see only a small fallback.
A Resilient Loading Wrapper
Encapsulate retry, timeout, fallback, and logging in one reusable loadRemote helper used everywhere remotes are mounted.
function loadRemote(name, fallback) {
return withTimeout(retry(() => import(name)))
.catch(e => { log(name, e); return fallback; });
}Quick Check
Test your remote-failure handling knowledge.
Recap
You learned to handle remote loading failures:
- Catch failures around dynamic
import() - Show a region-scoped fallback UI
- Add retry with backoff and timeouts
- Use versioned remoteEntry URLs to survive deploys
- Log failures and degrade gracefully
Resilient remote loading keeps the whole app standing when one part fails.
常见问题解答
「处理远程应用加载失败」课时是免费的吗？
是的 — 「处理远程应用加载失败」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Micro Frontends Architecture with Module Federation 课程的其余内容，请升级到 CoddyKit PRO。 Micro Frontends Architecture with Module Federation 课程共包含 4 节课。
「处理远程应用加载失败」这节课中我会学到什么？
学习检测并恢复联邦远程应用因网络错误、版本不匹配或部署问题而无法加载的情况。 你通过在浏览器中直接运行的动手代码来练习 Micro Frontends Architecture with Module Federation，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Micro Frontends Architecture with Module Federation 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Micro Frontends Architecture with Module Federation 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。
「处理远程应用加载失败」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Micro Frontends Architecture with Module Federation 课中编写并运行代码吗？
能。每节 Micro Frontends Architecture with Module Federation 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。