ヘッダ情報の取得

for命令
HTTP_USER_AGENT CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
HTTP_ACCEPT_LANGUAGE en-us,en;q=0.5
HTTP_REFERER


while命令
HTTP_USER_AGENT CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
HTTP_ACCEPT_LANGUAGE en-us,en;q=0.5
HTTP_REFERER


do...while命令
HTTP_USER_AGENT CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
HTTP_ACCEPT_LANGUAGE en-us,en;q=0.5
HTTP_REFERER