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