<p>Domain sharding <a href="https://love2dev.com/blog/domain-sharding-http-2/" rel="nofollow">is an http/2 antipattern</a>. Browsers and servers are supposed to detect sharding, but that doesn't always happen, for example if a.tile and b.tile resolve to different IP addresses - and even then, it still takes a bit of extra effort.</p>
<p>This detects whether the client is connecting over http/2, and instructs it not to use four subdomains to load tiles.</p>
<p>If the browser supports http/2, use a.tile.openstreetmap.org instead of {switch:a,b,c,d}.tile.openstreetmap.org and gps-a.tile.openstreetmap.org/lines/{z}/{x}/{y}.png instead of <a href="https://gps-%7Bs%7D.tile.openstreetmap.org/lines/%7Bz%7D/%7Bx%7D/%7By%7D.png" rel="nofollow">https://gps-{s}.tile.openstreetmap.org/lines/{z}/{x}/{y}.png</a>.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/2584'>https://github.com/openstreetmap/openstreetmap-website/pull/2584</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>If http2 supported, disable tile domain sharding</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2584/files#diff-04a887e53025b45e717150bdb931aa5a">vendor/assets/leaflet/leaflet.osm.js</a>
    (26)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2584.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/2584.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2584.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/2584.diff</a></li>
</ul>

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