<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/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/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: 2.7.6-SNAPSHOT</li>
<li>Operating System version: Mac</li>
<li>Java version: 1.8</li>
</ul>
<h3 dir="auto">Steps to reproduce this issue</h3>
<p dir="auto">run dubbo-samples-stub sample</p>
<h3 dir="auto">Expected Result</h3>
<p dir="auto">"stub - greeting dubbo"</p>
<h3 dir="auto">Actual Result</h3>
<p dir="auto">return "greeting dubbo"</p>
<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/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/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: 2.7.3</li>
<li>Operating System version: mac</li>
<li>Java version: 1.8</li>
</ul>
<p dir="auto">org.apache.dubbo.rpc.cluster.support.ClusterUtils#mergeUrl 这个里面写死了哪些provider key不可被consumer覆盖，比如TagRouter 需要的tag字段不可覆盖:copyOfLocalMap.remove(TAG_KEY);。<br>
能否把这个能力开放出来，来定制provider url 中哪些key不可覆盖。</p>