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Custom limits

Custom limits allow you to programmatically set limits on your customer’s Worker to set caps on usage. We support custom limits for CPU time and a number of subrequests.

​​ Set Custom limits

Custom limits can be set in the dynamic dispatch Worker:

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(
{// 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 });