C# 将字节后置到GraphQLAPI

这是我的密码

    private void button1_Click(object sender, EventArgs e)
    {
        PrepRequest("/graphql");
        byte[] betResponce =
        Bcodes("operationName:PrimediceRoll,variables:{currency:btc,amount:0,target:5,condition:below},query:mutation PrimediceRoll($amount: Float!, $target: Float!, $condition: CasinoGamePrimediceConditionEnum!, $currency: CurrencyEnum!) { primediceRoll(amount: $amount, target: $target, condition: $condition, currency: $currency) {...CasinoBetFragment state {...PrimediceStateFragment __typename    } __typename  }}fragment CasinoBetFragment on CasinoBet { id active payoutMultiplier amountMultiplier amount payout updatedAt currency game user { id name __typename  } __typename}fragment PrimediceStateFragment on CasinoGamePrimedice { result target condition __typename");      

}

试图通过http web请求以字节形式发送graphql。 在调试控制台中

引发异常：System.Net.Requests.dll中的“System.Net.WebException”

使用类似的方法，不要手动执行

  public byte[] Bcodes(string c)
    {
        byte[] ret = Encoding.UTF8.GetBytes(c);
        return ret;
    }