I’ve recently finished adding Google Analytics to a mobile App I’ve been working on for some time, and it’s been returning quite a few different error codes from the API.  So, I’m keeping track of them here along with their causes – to make debugging faster and easier in the future.

Status: 406 / Error: Not Acceptable / Error Thrown: Not Acceptable

1. A server side issue with the response
2. The session on the server timed out

Status: 0 / Error: error

1. user was unable to reach the server (most likely connection issue)

Status: 200 / Error: OK / Error Thrown: SyntaxError: Unexpected end of input –

1. Returned JSON was cut off (possibly connection issue)
2. No JSON whatsoever was returned
   

Status: 0 / Error: timeout / Error Thrown: timeout

1. duh, timeout!
   

Status: 200 / Error: OK / Error Thrown: SyntaxError: Unexpected token

1. Have HTML returning instead of JSON
   
2. Malformed JSON

Status: 401 / Error: Unauthorized / Error Thrown: Unauthorized

1. User tried to login with wrong username and password