tomhughes left a comment (openstreetmap/openstreetmap-website#5923)
I assume you're thinking about
https://github.com/rack/rack/blob/main/UPGRADE-GUIDE.md#response-headers-must-be-lower-case
which is technically about response headers though the same is essentially
true for request headers.
I think the reason they don't mention request headers is that the `headers`
object rack passes you is always a `Rack::Headers` object which does case
insensitive lookups, so the case here shouldn't matter.
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