On the fly (and free) SSL registration and renewal inside OpenResty/nginx with Let's Encrypt. This OpenResty plugin automatically and transparently issues SSL certificates from Let's Encrypt (a free certificate authority) as requests are received. By default, resty-auto-ssl will not perform any SSL registrations until you define the allow_domain function. You may return true to handle all possible domains, but be aware that bogus SNI hostnames can then be used to trigger an indefinite number...