问github API不支持的媒体类型415

EN

HTTP.call( 'GET', 'https://api.github.com/repos/hackmdio/hackmd/traffic/views', 
    {
        headers: 
        {
            'Content-Type':'application/json',
            "Accept":"application/vnd.github.v3+json",
            "User-Agent": "whales"
        },
    },
    function( error, response ) {
  if ( error ) {
    console.log('---------------------------error occurred-----------------------------------')
    console.log('---------------------------error occurred-----------------------------------')

    console.log( error );
  } else {

    console.log('--------------------------data got it!!-------------------------------------')
    console.log('--------------------------data got it!!-------------------------------------')

    console.log(response);
  }
});

{
  "message": "If you would like to help us test the Repo Traffic API during its preview period, you must specify a custom media type in the 'Accept' header. Please see the docs for full details.",
  "documentation_url": "https://developer.github.com/v3"
}