title: React native: How to call REST api with upper case request header name
body: <p>In react-native, When I use fetch or axios to call RESTful API, those library lowercase all request header name (See <a href="https://github.com/github/fetch/issues/610" rel="nofollow noreferrer">Github closed issue</a>). Is there anyway to workaround without changing the server (I call public API of the server that I can't change)?</p>
  
  <p>Thanks,
  Loc</p>