Александр Сергиенко, Senior Android Developer, DataArt
- 1. #gdg_kharkiv_center HTTP Cache Tips & Tricks (RFC 2616) Alexander Sergienko Senior Developer @ DataArt
- 2. #gdg_kharkiv_center Why do I need to do this? • Decrease traffic • Increase loading speed • Write less lines of code • Offline mode
- 3. #gdg_kharkiv_center How can I do this? URL DATA CREATED_AT UPDATED_AT HASH_CODE TEXT BLOB TEXT TEXT TEXT Enable HTTP cache private void enableHttpResponseCache() { try { long httpCacheSize = 10 * 1024 * 1024; // 10 MiB File httpCacheDir = new File(getExternalCacheDir(), "http"); HttpResponseCache.install(httpCacheDir, httpCacheSize); } catch (Exception httpResponseCacheNotAvailable) { Log.d(TAG, "HTTP response cache is unavailable."); } }
- 5. #gdg_kharkiv_center Content validation headers Request headers Response headers If-Modified-Since (HTTP Date) Last-Modified (HTTP Date) If-None-Match (Object Hash) ETag (Object Hash) HTTP Date RFC 822, updated by RFC 1123 Sun, 06 Nov 1994 08:49:37 GMT RFC 822, updated by RFC 1123 Sunday, 06-Nov-94 08:49:37 GMT RFC 822, updated by RFC 1123 Sun Nov 6 08:49:37 1994
- 7. #gdg_kharkiv_center Cache managing headers Request headers Response headers Cache-Control ("no-cache" ; "no-store"; "max-age" "=" delta-seconds ; "max-stale" "=" delta-seconds; "min-fresh" "=" delta-seconds ; "no-transform"; "only-if-cached") Cache-Control ("public"; "private"; "no-cache"; "no- store"; "no-transform"; "must- revalidate"; "proxy- revalidate"; "max-age" "=" delta-seconds; "s-maxage" "=" delta-seconds) Pragma (no-cache) Expires (HTTP Date)