Name
If-Modified-Since
Synopsis
If-Modified-Since:
date
Description
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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