HTTP/1.1 422 Unprocessable Entity
Server: nginx/1.4.4
Date: Mon, 20 Jan 2014 10:19:39 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 101
Connection: keep-alive
Access-Control-Allow-Credentials: true
Access-Control-Allow-Methods: GET, POST, HEAD, OPTIONS, DELETE
Access-Control-Max-Age: 300
Cache-Control: no-cache, no-store
Strict-Transport-Security: max-age=31556926; includeSubDomains

{
  "error":{
    "type":"request",
    "message":"The issuer is invalid",
    "field":"issuer"
  }
}
