When repeatedly querying the changeset download API, rarely but sometimes the following HTTP error 502 is returned:

With the reason given: DNS lookup failure for: rails3
How to reproduce
I could reproduce it by opening an url like https://api.openstreetmap.org/api/0.6/changeset/80149421/download in the browser and repeatedly reload the page, lots of times, until the error appears.
When repeatedly querying the changeset download API, rarely but sometimes the following HTTP error 502 is returned:
With the reason given: DNS lookup failure for: rails3
How to reproduce
I could reproduce it by opening an url like https://api.openstreetmap.org/api/0.6/changeset/80149421/download in the browser and repeatedly reload the page, lots of times, until the error appears.