IHttpClientFactory Form 提交参数

                MultipartFormDataContent content = new MultipartFormDataContent();
                content.Add(new StringContent(HttpUtility.UrlEncode(url)), "url");   //前面的为参数的值，后面的为参数name
                var client = _clientFactory.CreateClient();
                using var httpResponse = client.PostAsync(_wxApiUrl, content).GetAwaiter().GetResult();
                var result = JsonConvert.DeserializeObject<WxApiResult>(httpResponse.Content.ReadAsStringAsync().GetAwaiter().GetResult());