Request::getAuthorizationHeader() 

\nn\t3::Request()->getAuthorizationHeader(); 

Read the Authorization header from the request.

\nn\t3::Request()->getAuthorizationHeader();
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Important: If this does not work, the following line is probably missing in the .htaccess is probably missing the following line:

# nnhelpers: Use when PHP is executed in PHP CGI mode
RewriteRule . - E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
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| @return string

Source Code 

public function getAuthorizationHeader()
{
	$headers = null;
	if (isset($_SERVER['Authorization'])) {
		$headers = trim($_SERVER['Authorization']);
	} else if (isset($_SERVER['HTTP_AUTHORIZATION'])) {
		$headers = trim($_SERVER["HTTP_AUTHORIZATION"]);
	} elseif (function_exists('apache_request_headers')) {
		$requestHeaders = apache_request_headers();
		foreach ($requestHeaders as $k=>$v) {
			$requestHeaders[ucwords($k)] = $v;
		}
		if (isset($requestHeaders['Authorization'])) {
			$headers = trim($requestHeaders['Authorization']);
		}
	}
	return $headers;
}
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