使用的是百度的自然语言处理。

如果请求设置代理则会发生400 Bad Request错误！如果取消代理则恢复正常！

测试代码如下：

        static void Main(string[] args)
        {
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

            RestClient client = new RestClient("https://aip.baidubce.com");
            //设置代理后接口返回400
            //client.Proxy = new WebProxy("172.16.0.53",8888);
            client.Encoding = Encoding.GetEncoding("GBK");

            var request = new RestRequest("/rpc/2.0/nlp/v1/lexer", Method.POST);
            request.AddHeader("Content-Type", "application/json");
            request.AddQueryParameter("access_token", "your token");

            request.AddJsonBody(new Dictionary
            {
                ["text"] = "测试数据"
            });

            var response = client.Execute(request);
            response.ContentEncoding = "GBK";
            response.Content = Encoding.GetEncoding("GBK").GetString(response.RawBytes);
}

预期：希望能设置代理！