Distinguish CORS-blocked requests from genuine network failures using a no-cors probe, so users deploying via Docker see a specific message pointing to their JMAP server's CORS settings instead of a misleading "unable to reach the server" error.
Distinguish CORS-blocked requests from genuine network failures using a no-cors probe, so users deploying via Docker see a specific message pointing to their JMAP server's CORS settings instead of a misleading "unable to reach the server" error.