ios - Downloading file conditionally with timestamp, like curl -z -


i'm looking equivalent of curl -z some_date some_url using nsurlrequest of afnetworking. want download file url according it's timestamp on server.

(or curl -z local.file remote.file, automatically downloads remote.file if last modified later local.file was)

any ideas?

afnetworking uses nsurlrequest make requests; behavior same regardless of choose.

set nsurlrequest's cachepolicy property nsurlrequestuseprotocolcachepolicy , behavior done according cache-control headers sent down server. in cases, adding if-modified-since header request.


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