iPhoneでWi-Fi接続した時と3G接続した時のHTTPヘッダーの違いを調べてみた

自分のサーバに
[php]
<?php
print_r(getallheaders());
?>
[/php]
なコードを置いて、iPhoneのWi-Fi経由と3G経由でアクセスしたときの違い。

Wi-Fi
[php]
Array
(
[User-Agent] => Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_0 like Mac OS X; ja-jp) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5A345 Safari/525.20
[Cache-Control] => max-age=0
[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-jp
[Accept-Encoding] => gzip, deflate
[Connetction] => keep-alive
[Host] => www.musicstudio.jp
)
[/php]

3G
[php]
Array
(
[User-Agent] => Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_0 like Mac OS X; ja-jp) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5A345 Safari/525.20
[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-jp
[Accept-Encoding] => gzip, deflate
[Connetction] => keep-alive
[Host] => www.musicstudio.jp
)
[/php]

下の2つはおまけとして、なぜか3GのときはCache-Controlがなくなりました。
今のところ、固有ID的なものは発見できておりません。