Github user jpeach commented on the issue:
https://github.com/apache/trafficserver/pull/897
It is done in headers so that you can trivially hit the same URL with
different attributes. For example, hit URL1 with a short MaxAge to populate the
cache. Then hit URL1 again with a long delay to lock the cache entry, then hit
URL1. This is much harder to do with query parameters, though I have no
objection to adding them as an additional mechanism.
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