mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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v4だと https://www.kame.net/img/kame-noanime-small.gif が読まれるんですねえ。v6だと

<div class="center">
<img src="/img/kame-noanime-small.gif" alt="Non-dancing kame" /><br />
Use IPv6 HTTP and you will watch
<a href="/kame-mosaic.html">the dancing kame</a>

<br />
<!-- "dancing kame" designed by atelier momonga 1999.04.08 -->
</div>

の<img src…/a>までの部分に<script type="text/JavaScript">が挿入されるっぽ。

zunda

v6でcurlするとJavaScriptが挿入された版が来るからサーバ側でHTMLを出し分けてる感じわね。