WordPressはログインしているとno-cacheを返す

ログインしている場合。

Request URL:http://blog.lumiukko.jp/
Request Method:GET
Status Code:200 OK
Request Headersview source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Charset:Shift_JIS,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:ja,en-US;q=0.8,en;q=0.6
Cache-Control:max-age=0
Connection:keep-alive
Cookie:wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_6e853e5e5a40b2171a16112711dc94fc=hide%7C1326801834%7Ca490508c3a59564db655faa7305797c3; wp-settings-time-1=1326629034
Host:blog.lumiukko.jp
If-Modified-Since:Sun, 15 Jan 2012 12:04:00 GMT
Referer:http://blog.lumiukko.jp/wp-admin/
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_2) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

Response Headersview source
Cache-Control:no-cache, must-revalidate, max-age=0
Connection:keep-alive
Content-Type:text/html; charset=UTF-8
Date:Sun, 15 Jan 2012 12:04:09 GMT
Expires:Wed, 11 Jan 1984 05:00:00 GMT
Last-Modified:Sun, 15 Jan 2012 12:04:09 GMT
Pragma:no-cache
Server:nginx/0.8.54
Transfer-Encoding:chunked
X-Pingback:http://blog.lumiukko.jp/xmlrpc.php
X-Powered-By:PHP/5.3.8

ログインしていない場合

Request URL:http://blog.lumiukko.jp/
Request Method:GET
Status Code:200 OK
Request Headersview source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Charset:Shift_JIS,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:ja,en-US;q=0.8,en;q=0.6
Cache-Control:max-age=0
Connection:keep-alive
Cookie:wp-settings-time-1=1326621786; wordpress_test_cookie=WP+Cookie+check
Host:blog.lumiukko.jp
Referer:http://blog.lumiukko.jp/wp-login.php?loggedout=true
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_2) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

Response Headersview source
Connection:keep-alive
Content-Type:text/html; charset=UTF-8
Date:Sun, 15 Jan 2012 12:01:50 GMT
Server:nginx/0.8.54
Transfer-Encoding:chunked
X-Pingback:http://blog.lumiukko.jp/xmlrpc.php
X-Powered-By:PHP/5.3.8