Response HeaderETag
Beispiel:
ETag: W/"xyzzy"
Original Beschreibung (engl.):
The ETag response-header field provides the current value of the
entity tag for the requested variant. The headers used with entity
tags are described in sections 14.24, 14.26 and 14.44. The entity tag
MAY be used for comparison with other entities from the same resource
(see section 13.3.3).
ETag = "ETag" ":" entity-tag
Examples:
ETag: "xyzzy"
ETag: W/"xyzzy"
ETag: ""
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