Get Stream by User not working

API
6

You aren’t specifying the API version in your request so it is defaulting to v3 and you need v5.

jQuery example:

$.ajax({
 type: 'GET',
 url: 'https://api.twitch.tv/kraken/streams/26490481',
 headers: {
   'Client-ID': '<removed>',
   'Accept': 'application/vnd.twitchtv.v5+json'
 },
 success: function(data) {
   console.log(data);
 }
});