I am working with youtube api. when I hit this url \"https://www.googleapis.com/youtube/analytics/v1/reports?ids=channel%3D%3DMINE&start-date=2015-01-01&end-
In your request you are sending key={your key} for an access token you should be sending access_token={your oauth2 access token}
Note: Key is used for public requests. access token is for authenticated requests.