Running workers conditionally

[true willow]

Is it possible to run the worker conditionally and not for every incoming request?
In my case, I'd like the worker to run only for document (html) requests, meaning for every request pathname that does not include a period (since having a period in the pathname means directly requesting a file).

[rich bobcat]

I don't think you can achieve this with workers, unfortunately - routes matching doesn't have a way to exclude certain requests, so you could either use a transform rule to change the url (eg. add a prefix for html files that your worker route then matches), or use pages where I think you could use the include/exclude feature in _routes.json to achive this: https://developers.cloudflare.com/pages/functions/routing/#create-a-_routesjson-file