If-Match
header, defined in
RFC7232
The If-Match
header field makes the request method conditional on
the recipient origin server either having at least one current
representation of the target resource, when the field-value is "*",
or having a current representation of the target resource that has an
entity-tag matching a member of the list of entity-tags provided in
the field-value.
An origin server MUST use the strong comparison function when
comparing entity-tags for If-Match
, since the client
intends this precondition to prevent the method from being applied if
there have been any changes to the representation data.
If-Match = "*" / 1#entity-tag
"xyzzy"
- "xyzzy", "r2d2xxxx", "c3piozzzz"
use headers::IfMatch;
let if_match = IfMatch::any();
Create a new If-Match: *
header.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.