private Bootstrap select(boolean isDomainSocket, SessionProtocol desiredProtocol,
                             SerializationFormat serializationFormat) {
        final Bootstrap[][] bootstraps = isDomainSocket ? unixBootstraps : inetBootstraps;
        assert bootstraps != null;
        return bootstraps[desiredProtocol.ordinal()][toIndex(serializationFormat)];
    }
Determine {@link SslContext} by the specified {@link SessionProtocol}.
core/src/main/java/com/linecorp/armeria/client/Bootstraps.java