如何查看kotlin上rest api返回的验证错误？

data class ErrorResponse(val message: String, val code: Int)

import com.google.gson.Gson
import okhttp3.OkHttpClient
import okhttp3.Request

fun main() {
    val client = OkHttpClient()
    val request = Request.Builder()
        .url("https://api.example.com/endpoint")
        .build()

    val response = client.newCall(request).execute()
    val responseBody = response.body?.string()

    if (!response.isSuccessful) {
        // HTTP请求失败，可能存在验证错误
        val errorResponse = Gson().fromJson(responseBody, ErrorResponse::class.java)
        println("验证错误：${errorResponse.message}（错误码：${errorResponse.code}）")
    } else {
        // 处理成功响应
        // ...
    }
}

data class ErrorResponse(val message: String, val code: Int)