Why are Apache/php Headers in different case on Server vs local

Question

Is there an Apache or Php setting that would change a header returned by getallheaders() from Capitalized to lowercase?

On my localhost it receives an Authorization header but the same code returns authorization on the server. and the same client(Postman) is being used in both cases

Answer 1

$headers = array_change_key_case(getallheaders(), CASE_LOWER);