[sroussey]

What’s do you mean by correctly?

[kstrauser]

Incorrectly would be processing the query string and deduping keys. Correctly would be passing it through as-is, or at least only lightly processing it, like normalizing escaping or such.

[sroussey]

Indeed I would expect pass through with no changes.

Though there are “smart” CDNs that will resize images etc. all beats are off for those.