Inherited from Serializable
Inherited by implicit conversion any2stringadd from
If-Match to any2stringadd[If-Match]
Inherited by implicit conversion StringFormat from
If-Match to StringFormat[If-Match]
Inherited by implicit conversion ArrowAssoc from
If-Match to ArrowAssoc[If-Match]
RFC 7231 section 3.1
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Match