__           _            __
  / /__      __(_)___  _____/ /_____ ______
 / __/ | /| / / / __ \/ ___/ __/ __ `/ ___/
/ /_ | |/ |/ / / / / (__  ) /_/ /_/ / /
\__/ |__/|__/_/_/ /_/____/\__/\__,_/_/

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Add the latest version of twinstar to your Cargo.toml.

twinstar = "0.4.0" # check crates.io for the latest version

cargo add twinstar

Run

mkdir cert && cd cert
openssl req -x509 -nodes -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365

and enter your domain name (e.g. "localhost" for testing) as Common Name (CN).

Alternatively, if you want to include multiple domains add something like -addext "subjectAltName = DNS:localhost, DNS:example.org".