Rate limit implementation?

Seemed not possible with native Workers (even with Durable Objects), as `Date.now()` is a fixed value.

Maybe use a rate limit API running on external hosting solutions, e.g. Heroku?

An idea: `Workers =(per request)=> Throttler =(when reached rate limit)=> Write to KV`

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or just use Cloudflare Page Rules to rate limit, but a domain is needed for this to work.