HttpWebRequestExtensions.cs

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Runtime.Serialization;

namespace Azi.Tools
{
    /// <summary>
    /// Helper methods to work with Http protocol
    /// </summary>
    public static class HttpWebRequestExtensions
    {
        private static readonly HttpStatusCode[] successStatusCodes = { HttpStatusCode.OK, HttpStatusCode.Created, HttpStatusCode.PartialContent };
        internal static bool IsSuccessStatusCode(this HttpWebResponse response) => successStatusCodes.Contains(response.StatusCode);

        /// <summary>
        /// Returns response as string.
        /// </summary>
        /// <param name="response">Response to read.</param>
        /// <returns>String of response.</returns>
        public static async Task<string> ReadAsStringAsync(this HttpWebResponse response)
        {
            using (var reader = new StreamReader(response.GetResponseStream()))
            {
                return await reader.ReadToEndAsync().ConfigureAwait(false);
            }
        }

        /// <summary>
        /// Returns object as parsed JSON from response.
        /// </summary>
        /// <typeparam name="T">Type of object to parse</typeparam>
        /// <param name="response">Response to parse</param>
        /// <returns>Parsed object</returns>
        public static async Task<T> ReadAsAsync<T>(this HttpWebResponse response)
        {
            var text = await response.ReadAsStringAsync().ConfigureAwait(false);
            return JsonConvert.DeserializeObject<T>(text);
        }

        /// <summary>
        /// Returns ContentRange from headers.
        /// </summary>
        /// <param name="headers">Headers collection</param>
        /// <returns>ContentRange object</returns>
        public static ContentRangeHeaderValue GetContentRange(this WebHeaderCollection headers)
        {
            return ContentRangeHeaderValue.Parse(headers["Content-Range"]);
        }
    }
}