<p>Some stuff are served with a path which seems to be a MD5 hash<br>
menu-icon-ba3407aa1c5ff7b2153008abeb7f8789165716ecc0195a606d4569d0e8e0b716.png</p>
<p>If this is the case the browser will never ever will get an other file when requesting this resource.<br>
Modern browsers support the HTTP Header <code>Cache-Control: immutable</code> for such things.<br>
See this blog about it:<br>
<a href="http://bitsup.blogspot.de/2016/05/cache-control-immutable.html">http://bitsup.blogspot.de/2016/05/cache-control-immutable.html</a></p>

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