<p>I found one or two other posts mentioning this endpoint in the context of Tiles@Home, a project which is essentially dead since 2012.<br>
<a href="https://svn.openstreetmap.org/!svn/bc/20000/sites/other/tilesAtHome_tahngo/requests/views.py" rel="nofollow">https://svn.openstreetmap.org/!svn/bc/20000/sites/other/tilesAtHome_tahngo/requests/views.py</a></p>

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