Я пытался использовать библиотеку RestSharp для выполнения запросов, но когда я пытался сделать запрос POST, эта ошибка продолжает появляться !!
![enter image description here](https://i.stack.imgur.com/fpr7E.png)
Вот код:
private readonly string contentType = "application/json";
try
{
var restClient = new RestClient(new Uri(InvoiceExpressURLS.URL_createClient));
string clientJsonRequest =
JsonConvert.SerializeObject(
JsonConvert.DeserializeObject("{\"client\":" + JsonConvert.SerializeObject(newClient) + "}")
);
var request = new RestRequest(Method.POST);
request.RequestFormat = DataFormat.Json;
request.AddHeader("Content-Type", contentType);
request.AddJsonBody(clientJsonRequest);
var restResponse = await restClient.ExecuteTaskAsync<object>(request);
if (restResponse.IsSuccessful)
{
response.responseObject = restResponse.Data;
response.responseMessage = string.Format("The client \"{0}\" was successfuly created.", newClient.name);
}
else
{
response.responseStatus = restResponse.StatusCode;
response.responseMessage = restResponse.ErrorMessage;
}
}
catch (Exception e)
{
response.responseStatus = HttpStatusCode.InternalServerError;
response.responseMessage = e.Message;
response.responseObject = e;
}