自定义限制允许你以编程方式对客户 Workers 的资源使用实施限制。你可以为每次调用设置最大 CPU 时间和子请求数量。如果用户 Worker 触及任一限制，该用户 Worker 将立即抛出异常。
可在动态调度 Worker 中设置自定义限制：
export default {
async fetch(request, env) {
try {
// parse the URL, read the subdomain
let workerName = new URL(request.url).host.split(".")[0];
let userWorker = env.dispatcher.get(
workerName,
{},
{
// set limits
limits: { cpuMs: 10, subRequests: 5 },
},
);
return await userWorker.fetch(request);
} catch (e) {
if (e.message.startsWith("Worker not found")) {
// we tried to get a worker that doesn't exist in our dispatch namespace
return new Response("", { status: 404 });
}
return new Response(e.message, { status: 500 });
}
},
};