https://github.com/FiloSottile/mkcert
https://en.wikipedia.org/wiki/Certificate_signing_request
caddy和mkcert
https://gist.github.com/jet10000/356209d41764bc64ebee823b82a09cca
h2c
在许多环境中，您需要使用没有TLS 的 HTTP/2 协议，通常称为 h2c。
文章
https://dev.to/techschoolguru/a-complete-overview-of-ssl-tls-and-its-cryptographic-system-36pd
https://dev.to/techschoolguru/how-to-secure-grpc-connection-with-ssl-tls-in-go-4ph
https://dev.to/techschoolguru/use-grpc-interceptor-for-authorization-with-jwt-1c5h