<directivesynopsis>
<name>SSLEngine</name>
<description>SSL Engine Operation Switch</description>
-<syntax>SSLEngine on|off|optional</syntax>
+<syntax>SSLEngine on|off</syntax>
<default>SSLEngine off</default>
<contextlist><context>server config</context>
<context>virtual host</context></contextlist>
+<compatibility>
+ Support for the "optional" argument was removed in 2.4.64. It enabled
+ RFC 2817 (TLS Upgrade) support.
+</compatibility>
+
<usage>
<p>
</VirtualHost>
</highlight>
</example>
-<p><directive>SSLEngine</directive> can be set to <code>optional</code>:
-this enables support for
-<a href="https://www.rfc-editor.org/rfc/rfc2817">RFC 2817</a>.
-</p>
</usage>
</directivesynopsis>