The gdata links are from YouTube Data API v2.0 which is deprecated. You should look into Youtube Data API v3.0. Here is how to get started: https://developers.google.com/youtube/v3/
If you just want to get information about your channel use this link: https://content.googleapis.com/youtube/v3/channels?part=snippet&mine=true&key=YOURAPIKEY Replace YOURAPIKEY with the public access API key from https://console.developers.google.com/project