<p></p>
<p>When repeatedly querying the changeset download API, rarely but sometimes the following HTTP error 502 is returned:</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/4661658/79670238-d0349680-81c1-11ea-83ff-cb2e23bc1b4d.png"><img src="https://user-images.githubusercontent.com/4661658/79670238-d0349680-81c1-11ea-83ff-cb2e23bc1b4d.png" alt="image" style="max-width:100%;"></a></p>
<p>With the reason given: <strong>DNS lookup failure for: rails3</strong></p>
<h3>How to reproduce</h3>
<p>I could reproduce it by opening an url like <a href="https://api.openstreetmap.org/api/0.6/changeset/80149421/download" rel="nofollow">https://api.openstreetmap.org/api/0.6/changeset/80149421/download</a> in the browser and repeatedly reload the page, lots of times, until the error appears.</p>

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