Name
If-Modified-Since
Synopsis
If-Modified-Since
:date
Specifies that the URI data is to be sent only if it has been
modified since the date given as the value of this header. This is
useful for client-side caching. If the document has not been
modified, the server returns a code of 304
,
indicating that the client should use the local copy. The specified
date should follow the format described under the
Date
header.
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