object If-None-Match extends Serializable 

The "If-None-Match" header field makes the request method conditional
on a recipient cache or origin server either not having any current
representation of the target resource, when the field-value is "*",
or having a selected representation with an entity-tag that does not
match any of those listed in the field-value.

From RFC-7232

Source
If-None-Match.scala
Linear Supertypes
Serializable, Serializable, AnyRef, Any
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  1. If-None-Match
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Value Members

  1. val *: If-None-Match

    Match any existing entity

  2. def apply(first: EntityTag, rest: EntityTag*): If-None-Match
  3. implicit val headerInstance: Header[If-None-Match, Single]
  4. def parse(s: String): ParseResult[If-None-Match]