Common transfer-level errors

HTTP status codes corresponding to common SDK-related transfer-level errors are as follows:

/**
  * HTTP status code list, used on transfer level, signature errors, etc.
  */
enum HttpStatusCode {
   /**
    * Request in incorrect format. Common cause is server failing to deserialize due to request parameter error.
    */
   BAD_REQUEST = 400,
   /**
    * Invalid authentication information; usually of signature error
    */
   INVALID_AUTH = 401,
   /**
    * Clock non-synchronized on client side, with server-side refusal (to prevent replay attacks on signatures)
    */
   CLOCK_TOO_SKEWED = 412,
   /**
    * HTTP request too large
*/
   REQUEST_TOO_LARGE = 413,
   /**
    * internal error
    */
   INTERNAL_ERROR = 500,
}