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Re:Show HN: SWAPI – A Star Wars API by paulhallett on Friday December 05, 2014 @11:27AM (#8705278)
Local caching will be the way to go.

All resources will have a "date_updated" or similar attribute which you can check against.

Re:Show HN: SWAPI – A Star Wars API by slapresta on Friday December 05, 2014 @04:28PM (#8707033)
Ahh, if only HTTP had defined a standard header for checking if the requested content has been modified, and sending a specific status code if that's the case...