New: Use HTTP/2 in HttpClient

(cherry picked from commit 9ee09b9186a267844bd99b1a33f5959ba6461750)

src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs

@@ -45,7 +45,11 @@ namespace NzbDrone.Common.Http.Dispatchers
 
         public HttpResponse GetResponse(HttpRequest request, CookieContainer cookies)
         {
-            var requestMessage = new HttpRequestMessage(request.Method, (Uri)request.Url);
+            var requestMessage = new HttpRequestMessage(request.Method, (Uri)request.Url)
+            {
+                Version = HttpVersion.Version20,
+                VersionPolicy = HttpVersionPolicy.RequestVersionOrLower
+            };
             requestMessage.Headers.UserAgent.ParseAdd(_userAgentBuilder.GetUserAgent(request.UseSimplifiedUserAgent));
             requestMessage.Headers.ConnectionClose = !request.ConnectionKeepAlive;
 
@@ -122,7 +126,7 @@ namespace NzbDrone.Common.Http.Dispatchers
 
                 headers.Add(responseMessage.Content.Headers.ToNameValueCollection());
 
-                return new HttpResponse(request, new HttpHeader(headers), data, responseMessage.StatusCode);
+                return new HttpResponse(request, new HttpHeader(headers), data, responseMessage.StatusCode, responseMessage.Version);
             }
         }
 
@@ -159,6 +163,8 @@ namespace NzbDrone.Common.Http.Dispatchers
 
             var client = new System.Net.Http.HttpClient(handler)
             {
+                DefaultRequestVersion = HttpVersion.Version20,
+                DefaultVersionPolicy = HttpVersionPolicy.RequestVersionOrLower,
                 Timeout = Timeout.InfiniteTimeSpan
             };
 

src/NzbDrone.Common/Http/HttpResponse.cs

@@ -9,28 +9,31 @@ namespace NzbDrone.Common.Http
 {
     public class HttpResponse
     {
-        private static readonly Regex RegexSetCookie = new Regex("^(.*?)=(.*?)(?:;|$)", RegexOptions.Compiled);
+        private static readonly Regex RegexSetCookie = new ("^(.*?)=(.*?)(?:;|$)", RegexOptions.Compiled);
 
-        public HttpResponse(HttpRequest request, HttpHeader headers, byte[] binaryData, HttpStatusCode statusCode = HttpStatusCode.OK)
+        public HttpResponse(HttpRequest request, HttpHeader headers, byte[] binaryData, HttpStatusCode statusCode = HttpStatusCode.OK, Version version = null)
         {
             Request = request;
             Headers = headers;
             ResponseData = binaryData;
             StatusCode = statusCode;
+            Version = version;
         }
 
-        public HttpResponse(HttpRequest request, HttpHeader headers, string content, HttpStatusCode statusCode = HttpStatusCode.OK)
+        public HttpResponse(HttpRequest request, HttpHeader headers, string content, HttpStatusCode statusCode = HttpStatusCode.OK, Version version = null)
         {
             Request = request;
             Headers = headers;
             ResponseData = Headers.GetEncodingFromContentType().GetBytes(content);
             _content = content;
             StatusCode = statusCode;
+            Version = version;
         }
 
         public HttpRequest Request { get; private set; }
         public HttpHeader Headers { get; private set; }
         public HttpStatusCode StatusCode { get; private set; }
+        public Version Version { get; private set; }
         public byte[] ResponseData { get; private set; }
 
         private string _content;
@@ -84,7 +87,7 @@ namespace NzbDrone.Common.Http
 
         public override string ToString()
         {
-            var result = string.Format("Res: [{0}] {1}: {2}.{3} ({4} bytes)", Request.Method, Request.Url, (int)StatusCode, StatusCode, ResponseData?.Length ?? 0);
+            var result = $"Res: HTTP/{Version} [{Request.Method}] {Request.Url}: {(int)StatusCode}.{StatusCode} ({ResponseData?.Length ?? 0} bytes)";
 
             if (HasHttpError && Headers.ContentType.IsNotNullOrWhiteSpace() && !Headers.ContentType.Equals("text/html", StringComparison.InvariantCultureIgnoreCase))
             {
@@ -99,7 +102,7 @@ namespace NzbDrone.Common.Http
         where T : new()
     {
         public HttpResponse(HttpResponse response)
-            : base(response.Request, response.Headers, response.ResponseData, response.StatusCode)
+            : base(response.Request, response.Headers, response.ResponseData, response.StatusCode, response.Version)
         {
             Resource = Json.Deserialize<T>(response.Content);
         }