The Personal Blog of Jevgeni Tšaikin

Here is a sample method I’ve used for making a POST(HTTP Method) call to a HTTPS url using an instance of HttpWebRequest class:

/// <summary>
/// Method to make a POST call to a HTTPS url
/// </summary>
/// <param name="url">HTTPS url</param>
/// <param name="requestBody">content for a request</param>
private void MakeHTTPSPostCall(string url, string requestBody)
{
    HttpWebRequest webRequest = WebRequest.CreateHttp(url);
    webRequest.Method = "POST";
    webRequest.BeginGetRequestStream(
        requestResult =>
        {

            using (Stream postStream = webRequest.EndGetRequestStream(requestResult))
            {
                if (requestBody != null)
                {
                    byte[] byteArray = Encoding.UTF8.GetBytes(requestBody);
                    postStream.Write(byteArray, 0, requestBody.Length);
                }
            }
            webRequest.BeginGetResponse(
                responseResult =>
                {
                    try
                    {
                        using (var response =
                            (HttpWebResponse) webRequest.EndGetResponse(responseResult))
                        using (var streamResponse = response.GetResponseStream())
                        using (var streamRead = new StreamReader(streamResponse))
                        {
                            var responseString = streamRead.ReadToEnd();
                            var success = response.StatusCode == HttpStatusCode.OK;

                            // do something here with response...
                        }
                    }
                    catch (Exception ex)
                    {

                    }
                },
                null);
        },
        null);
}

Keep in mind that if your call does not have any content(request body) you still can not skip EndGetRequestStream part(shown bellow), because otherwise you will most likely get a HTTP 404 NotFound exception. Actually, any server-side error translates to a HTTP 404 on
the client.

using (Stream postStream = webRequest.EndGetRequestStream(requestResult))
{
...
}