| http://www.w3.org/ns/prov#value | - If I am a conditional request, I may modify my response code to NOT_MODIFIED if appropriate for the time given.ParameterswhenThe last time the resource being returned was modified, in seconds since the epoch. (type: number)ReturnsIf I am a If-Modified-Since conditional request and the time given is not newer than the condition, I return http.CACHED to indicate that you should write no body.
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