Get Header Authorization key in laravel controller ?

Trying to get the header authorization key in controller for making an API. Request is making from fiddler.

$headers = apache_request_headers();

And the $header contains an array.

Array
(
[User-Agent] => Fiddler
[Host] => localhost:8000
[Content-Length] => 102
[Authorization] => TestKey
)

If am trying like this to fetch the Authorization , its throwing error.

$header['Authorization]

Error :

Undefined index: Authorization

Tried many ways to get the authorization, but not working anything. Is there any way to fetch this?

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