Add X-Forward-(For/Proto) support

Jellyfin.Server/Extensions/ApiServiceCollectionExtensions.cs

@@ -18,6 +18,8 @@ using MediaBrowser.Common.Json;
 using MediaBrowser.Model.Entities;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.HttpOverrides;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.OpenApi.Models;
 using Swashbuckle.AspNetCore.SwaggerGen;
@@ -105,6 +107,10 @@ namespace Jellyfin.Server.Extensions
                 {
                     options.AddPolicy(ServerCorsPolicy.DefaultPolicyName, ServerCorsPolicy.DefaultPolicy);
                 })
+                .Configure<ForwardedHeadersOptions>(options =>
+                {
+                    options.ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto;
+                })
                 .AddMvc(opts =>
                 {
                     opts.UseGeneralRoutePrefix(baseUrl);