worker_connections are not enough while requesting certificate status (no replies)

I have seen errors in my logs: worker_connections are not enough while
requesting certificate status

I believe the main problem was that the worker_connections was set too low,
and I've fixed that.

However after looking at the source around the OCSP stapling, I have a
question -

It appears that ocsp responses are cached for five minutes, correct? When
the cached responses expire, does each worker make a new request? Or does
every new connection cause a request to be sent until one of the requests
(from each worker) receives a reply and populates the cache?
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