package response var ( // common errors ErrSuccess = newError(0, "ok") ErrBadRequest = newError(400, "Bad Request") ErrUnauthorized = newError(401, "Unauthorized") ErrNotFound = newError(404, "Not Found") ErrInternalServerError = newError(500, "Internal Server Error") // more biz errors ErrUsernameAlreadyUse = newError(1001, "The username is already in use.") )