Using an authorization header with Fetch in React Native

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Example fetch with authorization header:

fetch('URL_GOES_HERE', { 
    method: 'post', 
    headers: new Headers({
        'Authorization': 'Basic '+btoa('username:password'), 
        'Content-Type': 'application/x-www-form-urlencoded'
    }), 
    body: 'A=1&B=2'
});

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