~haruka/public_html/web/diary/

my.opera.comに限らず*.opera.comが重い理由なんて、その辺でよく使われてる画像とかてきとーに選んで、リロードしまくって、レスポンスヘッダのETagの値に注目すればすぐに原因に気がつく。


左上のMyOperaの画像とか。
http://my.opera.com/community/graphics/users/topmenu2/logo.gif



GET /community/graphics/users/topmenu2/logo.gif HTTP/1.1
Host: my.opera.com
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; ja-JP-mac; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: ja,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: Shift_JIS,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
If-Modified-Since: Thu, 10 Jan 2008 15:41:02 GMT
If-None-Match: "14442a-9eb-97dbf80"
Cache-Control: max-age=0



HTTP/1.x 304 Not Modified
Date: Mon, 09 Jun 2008 19:05:32 GMT
Server: Apache
Connection: Keep-Alive
Keep-Alive: timeout=15, max=100
Etag: "14442a-9eb-97dbf80"


----------------------------------------------------------

http://my.opera.com/community/graphics/users/topmenu2/logo.gif



GET /community/graphics/users/topmenu2/logo.gif HTTP/1.1
Host: my.opera.com
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; ja-JP-mac; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: ja,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: Shift_JIS,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
If-Modified-Since: Thu, 10 Jan 2008 15:41:02 GMT
If-None-Match: "14442a-9eb-97dbf80"
Cache-Control: max-age=0



HTTP/1.x 200 OK
Date: Mon, 09 Jun 2008 19:05:49 GMT
Server: Apache
Last-Modified: Thu, 10 Jan 2008 15:41:02 GMT
Etag: "644002-9eb-97dbf80"
Accept-Ranges: bytes
Content-Length: 2539
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: image/gif




参考：＠IT：事例に学ぶWebシステム開発のワンポイント（12） の「負荷分散装置でキャッシュが効かないのは？」の項目あたりとか。