Switch from HttpClientHandler to SocketsHttpHandler

SocketsHttpHandler is the default for .Net Core 2.1 and newer

Set RequestHeaderEncoding to UTF-8 by default

Jellyfin.Server/Startup.cs

@@ -1,5 +1,9 @@
+using System;
+using System.Net;
+using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Net.Mime;
+using System.Text;
 using Jellyfin.Networking.Configuration;
 using Jellyfin.Server.Extensions;
 using Jellyfin.Server.Implementations;
@@ -67,6 +71,12 @@ namespace Jellyfin.Server
             var acceptJsonHeader = new MediaTypeWithQualityHeaderValue(MediaTypeNames.Application.Json, 1.0);
             var acceptXmlHeader = new MediaTypeWithQualityHeaderValue(MediaTypeNames.Application.Xml, 0.9);
             var acceptAnyHeader = new MediaTypeWithQualityHeaderValue("*/*", 0.8);
+            Func<IServiceProvider, HttpMessageHandler> defaultHttpClientHandlerDelegate = (_) => new SocketsHttpHandler()
+            {
+                AutomaticDecompression = DecompressionMethods.All,
+                RequestHeaderEncodingSelector = (_, _) => Encoding.UTF8
+            };
+
             services
                 .AddHttpClient(NamedClient.Default, c =>
                 {
@@ -75,7 +85,7 @@ namespace Jellyfin.Server
                     c.DefaultRequestHeaders.Accept.Add(acceptXmlHeader);
                     c.DefaultRequestHeaders.Accept.Add(acceptAnyHeader);
                 })
-                .ConfigurePrimaryHttpMessageHandler(x => new DefaultHttpClientHandler());
+                .ConfigurePrimaryHttpMessageHandler(defaultHttpClientHandlerDelegate);
 
             services.AddHttpClient(NamedClient.MusicBrainz, c =>
                 {
@@ -84,7 +94,7 @@ namespace Jellyfin.Server
                     c.DefaultRequestHeaders.Accept.Add(acceptXmlHeader);
                     c.DefaultRequestHeaders.Accept.Add(acceptAnyHeader);
                 })
-                .ConfigurePrimaryHttpMessageHandler(x => new DefaultHttpClientHandler());
+                .ConfigurePrimaryHttpMessageHandler(defaultHttpClientHandlerDelegate);
 
             services.AddHealthChecks()
                 .AddDbContextCheck<JellyfinDb>();

MediaBrowser.Common/Net/DefaultHttpClientHandler.cs

@@ -1,19 +0,0 @@
-using System.Net;
-using System.Net.Http;
-
-namespace MediaBrowser.Common.Net
-{
-    /// <summary>
-    /// Default http client handler.
-    /// </summary>
-    public class DefaultHttpClientHandler : HttpClientHandler
-    {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="DefaultHttpClientHandler"/> class.
-        /// </summary>
-        public DefaultHttpClientHandler()
-        {
-            AutomaticDecompression = DecompressionMethods.All;
-        }
-    }
-}