Interestingly, quite a few places that should treat query strings transparently make a lot of assumptions about their structure. We ran into that when picking a new CDN, some providers didn't handle repeat parameters (?a=1&a=2) correctly.

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sroussey 3 hours ago | parent [-]

What’s do you mean by correctly?

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kstrauser 3 hours ago | parent [-]

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 3 hours ago \| parent [-]
		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.