The OpenSSL SSL_OP_NO_TLSvxxx options are deprecated for use in SSL_CTX_set_options().
As of OpenSSL 1.1 way to specify TLS versions is through a min-version and max-version scheme - this is more code future proof.
You can specify a minimum version and 0 for the maximum meaning the latest version.
Proton's interface to this allows more than can be specified using the min/max API as you can specify each protocol individually.
The proton code is also not future proof in that it "knows" about each TLS protocol individually in the code.
- is a clone of
PROTON-1989 TLS Configuration does not support TLSv1_3 in OpenSSL v1.1.1