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Expires is a HTTP/1.0 header, Cache-Control is HTTP/1.1 and used by anything created in the last 10-15 years. Most sites set the Expires header similar to their
by row1an 10y ago
Expires is a HTTP/1.0 header, Cache-Control is HTTP/1.1 and used by anything created in the last 10-15 years. Most sites set the Expires header similar to their Cache-Control max-age, but I guess Google just doesn't care and it doesn't really matter anyway.