<p><b>@mmd-osm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2485#discussion_r369634236">app/controllers/api_controller.rb</a>:</p>
<pre style='color:#555'>> +        if mime.symbol == :xml
+          request.format = "xml"
+          break
+        end
+
+        if mime.symbol == :json
+          request.format = "json"
+          break
+        end
+
+        # Any format, not explicitly requesting XML or JSON -> assume XML as default
+        if mime == "*/*"
+          request.format = "xml"
+          break
+        end
+      end
</pre>
<p>TODO: Add a comment here, that we deliberately don't set request.format, in case not XML, JSON or <em>/</em> was requested, so that an HTTP error is returned back to the client.</p>

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