Spotify.NET/SpotifyAPI.Docs/docs/error_handling.md

id	title
error_handling	Error Handling

API calls can fail when input data is malformed or the server detects issues with the request. As an example, the following request obviously fails:

var track = await spotify.Tracks.Get("NotExistingTrackId");
Console.WriteLine(track.Name);

When a request fails, an APIException is thrown. Specific errors may throw a child exception of APIException.

APIException

A very general API error. The message is parsed from the API response's JSON body and the response is available as a public property.

try {
  var track = await spotify.Tracks.Get("NotExistingTrackId");
} catch(APIException e) {
  // Prints: invalid id
  Console.WriteLine(e.Message);
  // Prints: BadRequest
  Console.WriteLine(e.Response?.StatusCode);
}

APIUnauthorizedException

Provides the same properties as APIException and occurs when the access token is expired or not provided. Notice that an access token has to be included in every request. Spotify does not allow unauthorized API access.

APITooManyRequestsException

Provides the same properties as APIException and occurs when too many requests has been sent by your application. It also provides the property TimeSpan RetryAfter, which maps to the received Retry-After header.

try {
  // call it very often?
  var track = await spotify.Tracks.Get("1s6ux0lNiTziSrd7iUAADH");
} catch(APITooManyRequestsException e) {
  // Prints: seconds to wait, often 1 or 2
  Console.WriteLine(e.RetryAfter);
}