xmlrpc4r 是 XMLRPC 的 Ruby 语言实现。XML-RPC提供了利用XML通过HTTP来调用远程方法。这个协议有点类似于SOAP，但更加方便。详细信息请看：XML-RPC homepage    <a href="/misc/goto?guid=4959500871221609673"><URL:http://www.xmlrpc.com/></a>。    <br />    <h3><a id="label-4" name="label-4">它具有以下特性：</a></h3>    <dl>     <dt>      <a id="label-5" name="label-5">Extensions</a>     </dt>    </dl>    <ul>     <li>Introspection</li>     <li>multiCall</li>     <li>optionally nil values and integers larger than 32 Bit</li>    </ul>    <dl>     <dt>      <a id="label-6" name="label-6">Server</a>     </dt>    </dl>    <ul>     <li>Standalone XML-RPC server</li>     <li>CGI-based (works with FastCGI)</li>     <li>Apache mod_ruby server</li>     <li>WEBrick servlet</li>    </ul>    <dl>     <dt>      <a id="label-7" name="label-7">Client</a>     </dt>    </dl>    <ul>     <li>synchronous/asynchronous calls</li>     <li>Basic HTTP-401 Authentification</li>     <li>HTTPS protocol (SSL)</li>    </ul>    <dl>     <dt>      <a id="label-8" name="label-8">Parser</a>     </dt>    </dl>    <ul>     <li>NQXMLStreamParser</li>     <li>NQXMLTreeParser</li>     <li>XMLStreamParser (fastest)</li>     <li>XMLTreeParser</li>     <li>REXMLStreamParser</li>     <li>XMLScanStreamParser</li>    </ul>    <dl>     <dt>      <a id="label-9" name="label-9">General</a>     </dt>    </dl>    <ul>     <li>possible to choose between XMLParser Module (Expat wrapper) and NQXML (pure Ruby) parsers</li>     <li>Marshalling Ruby objects to Hashs and reconstruct them later from a Hash</li>     <li>SandStorm component architecture Client interface</li>    </ul>    <p><strong>项目主页：</strong><a href="http://www.open-open.com/lib/view/home/1326617818233" target="_blank">http://www.open-open.com/lib/view/home/1326617818233</a></p>