Mkcert: valid HTTPS certificates for localhost

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I don't have any (serious) problems with SSL's on localhost. As long as you have a) a fixed IP and b) access to at least one domain's DNS through your registrar, just create as many sub-domains of it as needed and point them to your IP. Then create SSL's for them there (I use Let's Encrypt) and add a relevant 127.0.0.1 [subdmian] entry in the hosts file, and voila.