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一直以来，遇到的POST接口请求都是 键值对的json格式，最近对接了不少公安，发现body 的请求体都是直接放置字符串，虽然postman 中会报红，但是仍然可请求成功

            using (HttpClientHandler handle = new HttpClientHandler())
            using (HttpClient httpClient = new HttpClient(handle))
            {
                HttpRequestMessage httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, url);
                string appKey = "xxxx";
                //构造签名相关
                string timeStamp = "";
                string sign = GetSign(ref timeStamp, appKey);
                httpRequestMessage.Headers.Add("sign", sign);
                httpRequestMessage.Headers.Add("参数1", timeStamp);
                httpRequestMessage.Headers.Add("参数2", "xxxx");

                //var requestData = new { sign = args };  取消键值对，直接放body值 
                StringContent content = new StringContent(args, Encoding.UTF8, "application/json");
                httpRequestMessage.Content = content;
                var httpResponseMessage = httpClient.SendAsync(httpRequestMessage);
                string result = httpResponseMessage.Result.Content.ReadAsStringAsync().Result;
                return JsonConvert.DeserializeObject<dynamic>(result);
            }

在通过 https 请求时，有时候会遇到过安全验证问题，比如什么SSL， TLS啥的， 不得不说AI确实方便，一键输入，直接对话出结果，虽然时常不怎么靠谱，但是也提供了很多好思路，很适合比较社交恐惧的马龙， 需要设置一下证书回调，安全协议

           
            if (url.StartsWith("https"))
            {
                //设置证书，设置安全协议， 低版本二选一
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
                ServicePointManager.SecurityProtocol = (SecurityProtocolType)192 | (SecurityProtocolType)768 | (SecurityProtocolType)3072;
                //锦绣
                ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;
            }
            using (HttpClientHandler handle = new HttpClientHandler())
            using (HttpClient httpClient = new HttpClient(handle))
            {
                HttpRequestMessage httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, url);
                string appKey = "xxxx";
                //构造签名相关
                string timeStamp = "";
                string sign = GetSign(ref timeStamp, appKey);
                httpRequestMessage.Headers.Add("sign", sign);
                httpRequestMessage.Headers.Add("参数1", timeStamp);
                httpRequestMessage.Headers.Add("参数2", "xxxx");

                //var requestData = new { sign = args };  取消键值对，直接放body值 
                StringContent content = new StringContent(args, Encoding.UTF8, "application/json");
                httpRequestMessage.Content = content;
                var httpResponseMessage = httpClient.SendAsync(httpRequestMessage);
                string result = httpResponseMessage.Result.Content.ReadAsStringAsync().Result;
                return JsonConvert.DeserializeObject<dynamic>(result);
            }

回调方法的实现

        private bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }