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20100918 android cache

R
rroijnoigntroie

The document discusses HTTP caching in Android. It describes the different HTTP client libraries available in Android - java.net, Apache HttpClient, and android.webkit. It focuses on caching with Apache HttpClient and describes the Apache HttpClient Cache module, which implements HTTP 1.1 caching. Test results show that using the CachingHttpClient can improve performance over the DefaultHttpClient by caching HTTP responses.

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Android HTTP Cache ( ) 2010-09-18 2010-10-03
Android HTTP • java.net • Java • HTTP HttpURLConnection • org.apache.http • Apache HttpClient 4.0 Android • HTTP • android.webkit • Android Android UI Web • HTTP Web 2010-10-03
(HTTP ) • Android HTTP (3G 300kbps 2000kbps) • → → → 2010-10-03
( ) • • • ( ) • • →HTTP/1.1 Caching 2010-10-03
HTTP/1.1 Caching • RFC2616 • Web Web • HTTP/1.1 Caching HTTP 2010-10-03
HTTP/1.1 Caching • HTTP • If-Modified-Since • • If-None-Match • 2010-10-03
HTTP/1.1 Caching • HTTP • Expires • • Last-Modified • If-Modified-Since • ETag • If-None- Match 2010-10-03
HTTP/1.1 Caching • HTTP • Cache-Control • • Pragma • Proxy : no-cache 2010-10-03
HTTP/1.1 Caching • Apache lighthttpd Web • • ( 2010-10-03
HTTP/1.1 Caching • android.webkit HTTP/1.1 Caching • • →Apache HttpClient-Cache 2010-10-03
Apache HttpClient-Cache • Apache HttpClient 4.1 • HTTP/1.1 Caching • alpha (2010 9 ) 2010-10-03
Apache HttpClient-Cache • URL • http://hc.apache.org/ • Subversion URL • http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/httpclient-cache • jar http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/ svn get mvn package • Revision: 990924 (2010-09-05 ) 990925 Serialize NotSerializableException • Maven URL • http://repo1.maven.org/maven2/org/apache/httpcomponents/httpclient-cache/ 2010-10-03
Apache HttpClient-Cache • Caching : org.apache.http.client.HttpClient : CachingHttpClient • DefaultHttpClient CachingHttpClient • Android Apache HttpClient 4.0 ( ) • alpha ( ) 2010-10-03
Apache HttpClient-Cache • Cache HTTP • HTTP 1.1 • Method: GET • No Header: "Pragma" • No Header: "Cache-Control: no-store" • No Header: "Cache-Control: no-cache" • ※ org.apache.http.impl.client.cache.CacheableRequestPolicy 2010-10-03
Android • Eclipse • Android • Java Build Path Apache HttpClient 4.1 jar 2010-10-03
Android • Apache HttpClient-Cache HTTP • Cache Data Read/Write • • Cache Data Serialize • • ※org.apache.http.client.cache.HttpCacheStorage 2010-10-03
CachingHttpClient DefaultHttpClient Expires: Last-Modified: 281(ms) 122(ms) Etag: File Size: 295 KB Expires: Last-Modified: 50(ms) 125(ms) Etag: File Size: 4KB Expires: Last-Modified: 200 (ms) 128 (ms) Etag: File Size: 8KB ※HTTP GET HTTP Response ※5 ※Nexus One (Android 2.2) Wi-FI ※ : http://www1.axfc.net/uploader/Sc/so/154474.zip 2010-10-03
Caching →CachingHttpClient#execute() 2010-10-03
• Apache HttpClient-Cache • Caching Caching → HTTP Response • 2010 9 • HTTP Response Caching android.webkit 2010-10-03
URL • HTTP/1.1: Caching in HTTP • http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html • Web • http://www.atmarkit.co.jp/fjava/rensai2/webopt12/webopt12.html • Android • http://www.ibm.com/developerworks/jp/opensource/library/os-android- networking/ 2010-10-03
• Web • http://www.amazon.co.jp/dp/4774142042 2010-10-03

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20100918 android cache

  • 1. Android HTTP Cache ( ) 2010-09-18 2010-10-03
  • 2. Android HTTP • java.net • Java • HTTP HttpURLConnection • org.apache.http • Apache HttpClient 4.0 Android • HTTP • android.webkit • Android Android UI Web • HTTP Web 2010-10-03
  • 3. (HTTP ) • Android HTTP (3G 300kbps 2000kbps) • → → → 2010-10-03
  • 4. ( ) • • • ( ) • • →HTTP/1.1 Caching 2010-10-03
  • 5. HTTP/1.1 Caching • RFC2616 • Web Web • HTTP/1.1 Caching HTTP 2010-10-03
  • 6. HTTP/1.1 Caching • HTTP • If-Modified-Since • • If-None-Match • 2010-10-03
  • 7. HTTP/1.1 Caching • HTTP • Expires • • Last-Modified • If-Modified-Since • ETag • If-None- Match 2010-10-03
  • 8. HTTP/1.1 Caching • HTTP • Cache-Control • • Pragma • Proxy : no-cache 2010-10-03
  • 9. HTTP/1.1 Caching • Apache lighthttpd Web • • ( 2010-10-03
  • 10. HTTP/1.1 Caching • android.webkit HTTP/1.1 Caching • • →Apache HttpClient-Cache 2010-10-03
  • 11. Apache HttpClient-Cache • Apache HttpClient 4.1 • HTTP/1.1 Caching • alpha (2010 9 ) 2010-10-03
  • 12. Apache HttpClient-Cache • URL • http://hc.apache.org/ • Subversion URL • http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/httpclient-cache • jar http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/ svn get mvn package • Revision: 990924 (2010-09-05 ) 990925 Serialize NotSerializableException • Maven URL • http://repo1.maven.org/maven2/org/apache/httpcomponents/httpclient-cache/ 2010-10-03
  • 13. Apache HttpClient-Cache • Caching : org.apache.http.client.HttpClient : CachingHttpClient • DefaultHttpClient CachingHttpClient • Android Apache HttpClient 4.0 ( ) • alpha ( ) 2010-10-03
  • 14. Apache HttpClient-Cache • Cache HTTP • HTTP 1.1 • Method: GET • No Header: "Pragma" • No Header: "Cache-Control: no-store" • No Header: "Cache-Control: no-cache" • ※ org.apache.http.impl.client.cache.CacheableRequestPolicy 2010-10-03
  • 15. Android • Eclipse • Android • Java Build Path Apache HttpClient 4.1 jar 2010-10-03
  • 16. Android • Apache HttpClient-Cache HTTP • Cache Data Read/Write • • Cache Data Serialize • • ※org.apache.http.client.cache.HttpCacheStorage 2010-10-03
  • 17. CachingHttpClient DefaultHttpClient Expires: Last-Modified: 281(ms) 122(ms) Etag: File Size: 295 KB Expires: Last-Modified: 50(ms) 125(ms) Etag: File Size: 4KB Expires: Last-Modified: 200 (ms) 128 (ms) Etag: File Size: 8KB ※HTTP GET HTTP Response ※5 ※Nexus One (Android 2.2) Wi-FI ※ : http://www1.axfc.net/uploader/Sc/so/154474.zip 2010-10-03
  • 18. Caching →CachingHttpClient#execute() 2010-10-03
  • 19. • Apache HttpClient-Cache • Caching Caching → HTTP Response • 2010 9 • HTTP Response Caching android.webkit 2010-10-03
  • 20. URL • HTTP/1.1: Caching in HTTP • http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html • Web • http://www.atmarkit.co.jp/fjava/rensai2/webopt12/webopt12.html • Android • http://www.ibm.com/developerworks/jp/opensource/library/os-android- networking/ 2010-10-03
  • 21. • Web • http://www.amazon.co.jp/dp/4774142042 2010-10-03