remote error: tls: handshake failure

[feederbox826]

If you encounter remote error: tls: handshake failure, add

GODEBUG=tlsrsakex=1 to your environment variables, RSA keyExchange was dropped in Go 1.22

If you want to validate if the site is using RSA (broken) or ECDHE (OK), Go into the certificate view, if the certificate is provided by Let's Encrypt, CNs starting with R- are RSA, E- are ECDHE. This is also available under Details -> Certificate Fields -> Subject Public Key Info