A quick example of developing with #TLS (#HTTPS) on #localhost without certificate errors using mkcert:
https://source.ind.ie/hypha/spikes/deployment-1#simple-tls
(Part of the #Hypha Deployment 1 Spike: https://ar.al/2019/01/05/hypha-spike-deployment-1/)
@aral you usually should not need this, because (modern) browsers consider localhost a trusted source, so e.g. for all these HTTPS-only features, localhost will work, too. (even communicating from HTTPS to localhost is possible)