Cannot set the same Access-Control-Allow-Headers values in apache setting?

[charleshenryhugo]

I set Access-Control-Allow-Headers in apache conf as:
Header set Access-Control-Allow-Headers "X-Requested-With"

Then set the same value in laravel-cors config:
'allowed_headers' => ['X-Requested-With']

Then requests will be CORS blocked.

What't the reason of this?

[barryvdh]

Either set them in Apache, or use this module. Not both.