(< entity tag, "olemisilt")

olemus
protokolli HTTP element,
URL-aadressil asuva ressursi versiooni identifikaator,
mille seab veebiserver ja mis toetab tingimuslikke päringuid
=
an optional feature of the HTTP protocol used for Web cache validation and conditional requests from browsers for resources

ülevaateid
https://en.wikipedia.org/wiki/HTTP_ETag

https://stackoverflow.com/questions/27030570/what-is-the-difference-between-etag-and-expires-header

https://forums.asp.net/t/2133576.aspx?What+is+ETag+and+why+people+use+it

https://symfony.com/doc/current/http_cache/validation.html

standardid
https://tools.ietf.org/html/rfc7616
https://tools.ietf.org/html/rfc7232

turvalisus
https://www.xpertdeveloper.com/http-etag-explained/

https://www.tenable.com/plugins/nessus/88098

https://security.stackexchange.com/questions/12679/how-can-i-prevent-tracking-by-etags