ETag
Also written: If-None-Match
A header that tags the version of a response. The browser sends it back in `If-None-Match`, and if nothing changed the server answers `304 Not Modified` with no body.
Also written: If-None-Match
A header that tags the version of a response. The browser sends it back in `If-None-Match`, and if nothing changed the server answers `304 Not Modified` with no body.