I noticed that the page http://www.r7.com has the following http reponse header:
Cache-Control:!no-store,!bypass-cache,max-age=22s
What does the "!" exclamation mark character mean? Is that a negated expression?
What does "!" (exclamation mark) means in http header "Cache-Control: !no-store, !bypass-cache"?
499 Views Asked by Bruno Negrão Zica At
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The specification for
Cache-Control(RFC 7234) doesn't include any exclamation marks.This is unspecified behaviour. Only the operators of that website know what they mean, but general clients are unlikely to support it.