ody></table><h2 id=server-first-protocols>Server First Protocols</h2><p>Some protocols are &ldquo;Server First&rdquo; protocols, which means the server will send the first bytes. This may have an impact on
<a href=/v1.21/docs/reference/config/security/peer_authentication/#PeerAuthentication-MutualTLS-Mode><code>PERMISSIVE</code></a> mTLS and <a href=/v1.21/docs/ops/configuration/traffic-management/protocol-selection/#automatic-protocol-selection>Automatic protocol selection</a>.</p><p>Both of these features