Parametros del Header

Resultado:
array(7) { ["Host"]=> string(9) "localhost" ["User-Agent"]=>
string(100) "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_5)
AppleWebKit/536.30.1 (KHTML, like Gecko) Safari/522.0" ["Accept"]=>
string(63)
"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
["Cache-Control"]=> string(9) "max-age=0" ["Accept-Language"]=>
string(5) "es-es" ["Accept-Encoding"]=> string(13) "gzip, deflate"
["Connection"]=> string(10) "keep-alive" }