ios - NSURLRequest - get a cached response AND a current response? -

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before continue writing own infrastructure - possible execute request, have return if it's cached, , return later if cached version not match current version? kind of functionality built-in nsurlcache/nsurlrequest?

in other words:

  • request mything.json
  • return cached mything.json
  • display user
  • return again if cached version not current
  • update display

you can query nsurlcache directly via cachedresponseforrequest: find out whether in it. can issue nsurlrequest , see whether comes different. i'm not aware of built-in mechanism give first that's in cache whatever fetched, if determines needs fetched , if fetched different.


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