<p><em>Background</em><br>
Conducting a simple refresh (f5) on a recently downloaded <a href="https://www.openstreetmap.org/way/17236956" rel="nofollow">test map page</a> causes only half (10 out of 21) of the files to give a <code>304 Not Modified</code>. Obviously <em>Not Good</em> both for the user (slow) plus OSM (increased bandwidth + load).</p>
<p>Some of those files may well be dynamic, but some are clearly static. Because of the wide range of <em>Response Header</em> symptoms + my ignorance these are individual filetype reports to allow those with a working knowledge of the code to decipher it all. Please also note that since these tests the <a href="https://github.com/openstreetmap/operations/issues/305" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/operations/issues/305/hovercard"><code>Last-Modified</code> value</a> has been re-enabled & <code>eTag</code> disabled.</p>
<p><em>The meat</em><br>
A disparate bunch of (probably) static files.</p>
<ul>
<li>
<p>3 x CSS<br>
eg <a href="https://www.openstreetmap.org/assets/screen-ltr-56c86771fc241440e36145999d4069209b6ea9ce7e508d48090ae525920df422.css" rel="nofollow">https://www.openstreetmap.org/assets/screen-ltr-….css</a></p>
</li>
<li>
<p>1 x GIF<br>
eg <a href="https://www.openstreetmap.org/assets/searching-d2110831ff86cb780e0911cd005e82482bfc71a0c626b56812ece6d52db2e6e0.gif" rel="nofollow">https://www.openstreetmap.org/assets/searching-….gif</a></p>
</li>
<li>
<p>3 x JS<br>
eg <a href="https://www.openstreetmap.org/assets/application-7dc66b028055a8a9bfe43cf7d19b6a06b3a64a54efcbb1ae996f40ae3d5209c1.js" rel="nofollow">https://www.openstreetmap.org/assets/application-….js</a></p>
</li>
<li>
<p>7 x PNG<br>
eg <a href="https://www.openstreetmap.org/assets/directions-40b86df47e67e386cb848cb45095c340f45a8283778f9205e3ae9cc1b371dc65.png" rel="nofollow">https://www.openstreetmap.org/assets/directions-….png</a></p>
</li>
<li>
<p>2 x SVG<br>
eg <a href="https://www.openstreetmap.org/assets/osm_logo-0e91a8acd0a92c1bf14204322322e57c65c2a7e318fec6907252fed929b7d6d3.svg" rel="nofollow">https://www.openstreetmap.org/assets/osm_logo-….svg</a></p>
</li>
<li>
<p><code>Last-Modified</code>: not present</p>
</li>
<li>
<p><code>eTag</code>: not present</p>
</li>
<li>
<p><code>Expires</code>: Mon, 15 Jun 2020 13:46:41 GMT</p>
</li>
<li>
<p>Request: (no IM, INM, IMS, etc. so no 304)</p>
</li>
</ul>
<p><em>Related</em><br>
The tiles supplied by <em>toothless</em> (eg <a href="https://b.tile.openstreetmap.org/18/130245/85447.png" rel="nofollow">https://b.tile.openstreetmap.org/18/130245/85447.png</a>) are all dynamic yet all have a strong <code>eTag</code> (matched by the <code>If-None-Match</code>) + <code>Expires</code> and thus get cached + a 304.</p>
<p><em>Extra</em><br>
See bottom of <a href="https://www.openstreetmap.org/user/alexkemp/diary/368814" rel="nofollow">this Diary page</a> for fuller details.</p>

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