I am building an app and after a response from the backend, I need to extract the body of the http response but I cannot find a good way to do it. The response has an error code 400 and when this happen, I need to extract the body to checkout the specific response.

withContext(Dispatchers.IO) {
            when(val response = api.create(id = id, type = type)) {
                is CanooResult.Success -> {
                    Result.Success(it.status)
                }
                is Result.Error -> {
                    Result.Error(throwable = response.error, data = handleServerError(response.error))
                }
                else -> Result.Error(throwable = Throwable("Unknown error"))
            }
        }

In my case I reach is Result.Error -> which is exepected but I cannot properly implement handleServerError

the code is as below:

private fun handleServerError(error: Throwable?): String {
        val exception = error as? HttpException
        val errorBody = exception?.response()?.errorBody()?.string()

        //val err = error as HttpException
        val bodyJson = Gson().fromJson(
            errorBody,ServerError::class.java
        )
        return when (bodyJson.errorCode) {
            ERR_TYPE -> ERR_GENERIC
            ERR_DUP -> ERR_DUPLICATE_PROD
            else -> UNKNOWN_ERROR
        }
    }

And the ServerError class is as below:

data class ServerError(
    val message: String,
    val errorCode: Int,
)

below is an image of the response I grab using AS.

Any idea what is the issue ?