Changing URL alias individually does not invalidate cached responses
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3034212. -->
Reported by: [rp7](https://www.drupal.org/user/219330)
>>>
<p>Path changes do not update cached Decoupled Router responses.</p>
<p>Scenario #1:</p>
<ol>
<li>Create an article and give it the alias<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">hello</span><span style="color: #007700">-</span><span style="color: #0000BB">world<br>?></span></span></pre></div>
</li>
<li>Visit<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">router</span><span style="color: #007700">/</span><span style="color: #0000BB">translate</span><span style="color: #007700">-</span><span style="color: #0000BB">path</span><span style="color: #007700">?</span><span style="color: #0000BB">_format</span><span style="color: #007700">=</span><span style="color: #0000BB">json</span><span style="color: #007700">&</span><span style="color: #0000BB">path</span><span style="color: #007700">=/</span><span style="color: #0000BB">hello</span><span style="color: #007700">-</span><span style="color: #0000BB">world<br>?></span></span></pre></div>
<p> anonymously so that it gets (page) cached by Drupal</p></li>
<li>Visit<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">admin</span><span style="color: #007700">/</span><span style="color: #0000BB">config</span><span style="color: #007700">/</span><span style="color: #0000BB">search</span><span style="color: #007700">/</span><span style="color: #0000BB">path<br>?></span></span></pre></div>
<p> and edit the<br>
</p><div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">hello</span><span style="color: #007700">-</span><span style="color: #0000BB">world<br>?></span></span></pre></div>
<p> alias</p></li>
<li>Change the alias to<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">hello</span><span style="color: #007700">-</span><span style="color: #0000BB">there<br>?></span></span></pre></div>
</li>
<li>Visit<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">router</span><span style="color: #007700">/</span><span style="color: #0000BB">translate</span><span style="color: #007700">-</span><span style="color: #0000BB">path</span><span style="color: #007700">?</span><span style="color: #0000BB">_format</span><span style="color: #007700">=</span><span style="color: #0000BB">json</span><span style="color: #007700">&</span><span style="color: #0000BB">path</span><span style="color: #007700">=/</span><span style="color: #0000BB">hello</span><span style="color: #007700">-</span><span style="color: #0000BB">world<br>?></span></span></pre></div>
<p> again</p></li>
</ol>
<p>You will see that Decoupled Router still returns the response that was cached earlier, even though this URL no longer exists within Drupal.</p>
<p>Scenario #2:</p>
<ol>
<li>Request Decoupled Router for a non-existing path, eg.<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">router</span><span style="color: #007700">/</span><span style="color: #0000BB">translate</span><span style="color: #007700">-</span><span style="color: #0000BB">path</span><span style="color: #007700">?</span><span style="color: #0000BB">_format</span><span style="color: #007700">=</span><span style="color: #0000BB">json</span><span style="color: #007700">&</span><span style="color: #0000BB">path</span><span style="color: #007700">=/</span><span style="color: #0000BB">drupal</span><span style="color: #007700">-</span><span style="color: #0000BB">rocks<br>?></span></span></pre></div>
<p>. Decoupled Router will give you a 404 response. Make sure this is done anonymously so that it gets (page) cached by Drupal.</p></li>
<li>Create an article and give it the alias<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">drupal</span><span style="color: #007700">-</span><span style="color: #0000BB">rocks<br>?></span></span></pre></div>
</li>
<li>Visit<br>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">/</span><span style="color: #0000BB">router</span><span style="color: #007700">/</span><span style="color: #0000BB">translate</span><span style="color: #007700">-</span><span style="color: #0000BB">path</span><span style="color: #007700">?</span><span style="color: #0000BB">_format</span><span style="color: #007700">=</span><span style="color: #0000BB">json</span><span style="color: #007700">&</span><span style="color: #0000BB">path</span><span style="color: #007700">=/</span><span style="color: #0000BB">drupal</span><span style="color: #007700">-</span><span style="color: #0000BB">rocks<br>?></span></span></pre></div>
<p> again</p></li>
</ol>
<p>You will see that Decoupled Router still returns the 404 response, even though "/drupal-rocks" is now a valid path.</p>
> Related issue: [Issue #2480077](https://www.drupal.org/node/2480077)
issue
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