CORS - Wrong 'Access-Control-Allow-Origin' header

API
10

So after some digging turns out that newer ClientID’s made after a certain date have the CORS issue.

You can also try:

fetch(
    'https://api.twitch.tv/kraken/videos/SOMEID',
    {
        headers: {
            'client-id': 'SOMECLIENTID',
            'accept': 'application/vnd.twitchtv.v5+json'
        }
    }
)
.then(resp => { return resp.json() })
.then(resp => { console.log(resp) })
.catch(err => { console.log(err) });

In testing the issue occurs when you omit the V5 header when using a “new” client ID. It trips up and issues Two CORS headers

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