<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/apache/incubator-dubbo/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have checked the <a href="https://github.com/apache/incubator-dubbo/blob/master/FAQ.md">FAQ</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h3 dir="auto">Environment</h3>
<ul dir="auto">
<li>Dubbo version: dubbo2.7.1</li>
<li>Operating System version: windows 10</li>
<li>Java version: java 8</li>
</ul>
<h3 dir="auto">Steps to reproduce this issue</h3>
<ol dir="auto">
<li>dubbo 2.5.3版本下自定义扩展Invoker</li>
<li>升级dubbo版本至2.7.1</li>
</ol>
<p dir="auto">Pls. provide [GitHub address] to reproduce this issue.</p>
<h3 dir="auto">Expected Result</h3>
<p dir="auto">What do you expected from the above [steps？]<br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/26382649/56411587-d85aad00-62b3-11e9-8001-7aa586dd4f45.png"><img src="https://user-images.githubusercontent.com/26382649/56411587-d85aad00-62b3-11e9-8001-7aa586dd4f45.png" alt="image" style="max-width: 100%;"></a><br>
dubbo 2.5.3版本下自定义扩展Invoker，在dubbo2.7.1环境下运行，消费端直接返回null，这里default invoke方法应该调用接口定义的老版本invoke方法</p>
<h3 dir="auto">Actual Result</h3>
<p dir="auto">What actually happens?<br>
return null</p>
<p dir="auto">If there is an exception, please attach the exception trace:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Just put your stack trace here!"><pre class="notranslate"><code class="notranslate">Just put your stack trace here!
</code></pre></div>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> I have searched the <a href="https://github.com/apache/incubator-dubbo/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> I have checked the <a href="https://github.com/apache/incubator-dubbo/blob/master/FAQ.md">FAQ</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h3 dir="auto">Environment</h3>
<ul dir="auto">
<li>Dubbo version: 2.6.1</li>
<li>Operating System version: xxx</li>
<li>Java version: xxx</li>
</ul>
<h3 dir="auto">Steps to reproduce this issue</h3>
<p dir="auto">how config dubbo(x) to support websocket,I've tried many methods, but didn't work.</p>
<p dir="auto">don't know how to config rest easy to support it.</p>