{
    title:  "Compatibility",
    crumbs: [
        { 'Reference Guide': '../ref/' },
    ],
}
            <h1>Compatibility</h1>
            <p>GoAhead supports the following standards:</p>
            <ul>
                <li><a href="http://www.w3.org/Protocols/rfc2616/rfc2616.html">HTTP/1.1</a></li>
                <li><a href="http://www.w3.org/CGI/">CGI 1.1</a></li>
                <li><a href="http://www.ietf.org/rfc/rfc1867.txt">Form-based File Upload in HTML</a></li>
            </ul><a id="api"></a>
            <h2 >API Compatibility</h2>
            <p>The GoAhead APIs are evolving, and are thus subject to change between minor releases. The documentation
            provides a <a href="stability.html">Stability Classification</a> for each API group that reflects
            their stability with regard to backwards compatibility.</p>
            <p>We do <b>not</b> provide a blanket commitment to backward compatibility.  Rather, we adopt a more 
            surgical approach on an API by API basis.</p>
            
            <h2>Migrating to GoAhead 3</h2>
            <p>GoAhead 3 is major upgrade relative to GoAhead 2. Some APIs have changed and new APIs have
            been added for increased functionality. Where the APIs have changed, their core functionality and 
            operation typically remains similar. You can migrate code from GoAhead 2 to GoAhead 3 with 
            simple refactoring.</p>
            <a name="legacy"></a>
            <h3>Legacy API Support</h3> 
            <p>The configure command has an option to maximize backward 
            compatibility and assist migration by supporting the legacy APIs. Use 
            <em>configure --set legacy=true</em> to enable the legacy APIs.</p>