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return response()->view('your_view', compact('variableName'))->header('Content-Type', 'application/xml');
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public function yourControllerFunction(\Illuminate\Http\Request $request)
{
$header = $request->header('Authorization');
// do some stuff
}
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return response($content)
->header('Content-Type', $type)
->header('X-Header-One', 'Header Value')
->header('X-Header-Two', 'Header Value');