Simple wrapper for HttpClient to do REST requests

RestClient.cs

using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace Helpers.Web
{
    public class RestClient
    {
        private static readonly HttpClient Client;

        /// <summary>
        /// Create a static configured version of HttpClient, we do not want to implement using statements
        /// because of how HttpClient behaves. Read: https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/implement-resilient-applications/use-httpclientfactory-to-implement-resilient-http-requests.
        /// Also we cannot use HttpClientFactory since we are not .net standard.
        /// </summary>
        static RestClient()
        {
            Client = new HttpClient();
            Client.DefaultRequestHeaders.Accept.Clear();
            Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            Client.DefaultRequestHeaders.Add("X-AppSecretToken", Settings.GetAppSecretToken);
            Client.DefaultRequestHeaders.Add("X-AgreementGrantToken", Settings.GetAgreementGrantToken);
        }

        public static Task<HttpResponseMessage> GetAsync(string url)
        {
            return Client.GetAsync(url);
        }

        public static Task<HttpResponseMessage> PostAsync(string url, HttpContent content)
        {
            return Client.PostAsync(url, content);
        }
        
        public static T DeserializeJsonFromStream<T>(Stream stream)
        {
            if (stream == null || stream.CanRead == false)
                return default(T);

            using (var sr = new StreamReader(stream))
            using (var jtr = new JsonTextReader(sr))
            {
                var serializer = new JsonSerializer();
                var result = serializer.Deserialize<T>(jtr);
                return result;
            }
        }

    }
}