demo · v141

NVS in disk cache

Set a No-Vary-Search rule, then test whether two URLs would share a disk cache entry. The classifier implements the spec algorithm in JS so you can see exactly which query parameters get ignored when computing the cache key.

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the header

HTTP/1.1 200 OK
Content-Type: text/html
Cache-Control: max-age=3600
No-Vary-Search: params=("utm_source" "utm_medium" "fbclid")

# Now in Chrome 141 the disk cache (not just the in-memory cache)
# treats the listed query parameters as irrelevant to identity.
# Two requests that differ only by those keys hit the same entry.

see also