<div class="directive-section"><h2><a name="SSLEngine" id="SSLEngine">SSLEngine</a> <a name="sslengine" id="sslengine">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>SSL Engine Operation Switch</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLEngine on|off</code></td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLEngine on|off|optional</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLEngine off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
...<br />
</VirtualHost>
</code></p></div>
+<p>New in Apache 2.1, <code class="directive">SSLEngine</code> can be set to <code>
+optional</code>. This enables support for
+<a href="http://www.ietf.org/rfc/rfc2817.txt">RFC 2817</a>, Upgrading to TLS
+Within HTTP/1.1. At this time no web browsers support RFC 2817.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<directivesynopsis>
<name>SSLEngine</name>
<description>SSL Engine Operation Switch</description>
-<syntax>SSLEngine on|off</syntax>
+<syntax>SSLEngine on|off|optional</syntax>
<default>SSLEngine off</default>
<contextlist><context>server config</context>
<context>virtual host</context></contextlist>
...<br />
</VirtualHost>
</example>
+<p>New in Apache 2.1, <directive>SSLEngine</directive> can be set to <code>
+optional</code>. This enables support for
+<a href="http://www.ietf.org/rfc/rfc2817.txt">RFC 2817</a>, Upgrading to TLS
+Within HTTP/1.1. At this time no web browsers support RFC 2817.</p>
</usage>
</directivesynopsis>
proxied resources</td></tr>
<tr><td><a href="mod_proxy.html#proxymaxforwards">ProxyMaxForwards <var>number</var></a></td><td> 10 </td><td>sv</td><td>E</td></tr><tr><td class="descr" colspan="4">Maximium number of proxies that a request can be forwarded
through</td></tr>
-<tr class="odd"><td><a href="mod_proxy.html#proxypass">ProxyPass [<var>path</var>] !|<var>url</var></a></td><td></td><td>svd</td><td>E</td></tr><tr class="odd"><td class="descr" colspan="4">Maps remote servers into the local server URL-space</td></tr>
+<tr class="odd"><td><a href="mod_proxy.html#proxypass">ProxyPass [<var>path</var>] !|<var>url</var> [<var>key=value</var> <var>key=value</var> ...]]</a></td><td></td><td>svd</td><td>E</td></tr><tr class="odd"><td class="descr" colspan="4">Maps remote servers into the local server URL-space</td></tr>
<tr><td><a href="mod_proxy.html#proxypassreverse">ProxyPassReverse [<var>path</var>] <var>url</var></a></td><td></td><td>svd</td><td>E</td></tr><tr><td class="descr" colspan="4">Adjusts the URL in HTTP response headers sent from a reverse
proxied server</td></tr>
<tr class="odd"><td><a href="mod_proxy.html#proxypassreversecookiedomain">ProxyPassReverseCookieDomain <var>internal-domain</var> <var>public-domain</var></a></td><td></td><td>svd</td><td>E</td></tr><tr class="odd"><td class="descr" colspan="4">Adjusts the Domain string in Set-Cookie headers from a reverse-
<tr><td><a href="mod_ssl.html#sslciphersuite">SSLCipherSuite <em>cipher-spec</em></a></td><td> ALL:!ADH:RC4+RSA:+H +</td><td>svdh</td><td>E</td></tr><tr><td class="descr" colspan="4">Cipher Suite available for negotiation in SSL
handshake</td></tr>
<tr class="odd"><td><a href="mod_ssl.html#sslcryptodevice">SSLCryptoDevice <em>engine</em></a></td><td> builtin </td><td>s</td><td>E</td></tr><tr class="odd"><td class="descr" colspan="4">Enable use of a cryptographic hardware accelerator</td></tr>
-<tr><td><a href="mod_ssl.html#sslengine">SSLEngine on|off</a></td><td> off </td><td>sv</td><td>E</td></tr><tr><td class="descr" colspan="4">SSL Engine Operation Switch</td></tr>
+<tr><td><a href="mod_ssl.html#sslengine">SSLEngine on|off|optional</a></td><td> off </td><td>sv</td><td>E</td></tr><tr><td class="descr" colspan="4">SSL Engine Operation Switch</td></tr>
<tr class="odd"><td><a href="mod_ssl.html#sslhonorcipherorder">SSLHonorCiperOrder <em>flag</em></a></td><td></td><td>sv</td><td>E</td></tr><tr class="odd"><td class="descr" colspan="4">Option to prefer the server's cipher preference order</td></tr>
<tr><td><a href="mod_ssl.html#sslmutex">SSLMutex <em>type</em></a></td><td> none </td><td>s</td><td>E</td></tr><tr><td class="descr" colspan="4">Semaphore for internal mutual exclusion of
operations</td></tr>