Post method in unity

PostUnity.cs

    private IEnumerator PostRegistrationDetails(string jsonData)
    {
        var raw = Encoding.UTF8.GetBytes(jsonData);
        using UnityWebRequest webRequest = UnityWebRequest.Post(uriPostResults, "POST");
        webRequest.SetRequestHeader("Content-Type", "application/json");
        webRequest.uploadHandler = new UploadHandlerRaw(raw);
        webRequest.uploadHandler.contentType = "application/json";
        webRequest.downloadHandler = new DownloadHandlerBuffer();
        webRequest.SendWebRequest();
        if (webRequest.isNetworkError || webRequest.isHttpError)
        {
            Debug.Log("Error: " + webRequest.error);
        }
        else
        {
            Debug.Log("Success");
        }

        yield return new WaitForSeconds(1f);
    }