Reports the value of the If-Modified-Since header of the HTTP request message.
property IfModifiedSince: TDateTime;
__property TDateTime IfModifiedSince;
Read IfModifiedSince on a request with a MethodType of mtGet to determine whether the request is conditional. If the information requested by the Web client was not modified since the time indicated by IfModifiedSince, the response should be a not modified error rather than the information indicated by the URL property.
The value of IfModifiedSince is given according to the local clock, not the clock of the Web client.
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