Added workaround for Nginx and Docker

Dockerfile

@@ -20,4 +20,5 @@ RUN dotnet publish -c release -o /app --no-restore
 FROM mcr.microsoft.com/dotnet/aspnet:6.0
 WORKDIR /app
 COPY --from=build /app ./
+ENV INSIDE_DOCKER=true
 ENTRYPOINT ["dotnet", "Server.dll"]

server/Startup.cs

@@ -1,6 +1,9 @@
+using System;
+using System.Net;
 using System.Text.Json;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.HttpOverrides;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -18,6 +21,11 @@ namespace Server {
 
 		// This method gets called by the runtime. Use this method to add services to the container.
 		public void ConfigureServices(IServiceCollection services) {
+			if ((Environment.GetEnvironmentVariable("INSIDE_DOCKER") ?? "").Length > 0) {
+				services.Configure<ForwardedHeadersOptions>(options => {
+					options.KnownProxies.Add(Dns.GetHostAddresses("host.docker.internal")[0]);
+				});
+			}
 			services.AddSingleton<IDataManager, DataManager>();
 			services.AddSingleton<IDatabase, Database>();
 			services.AddSingleton<NodaTime.IDateTimeZoneProvider>(NodaTime.DateTimeZoneProviders.Tzdb);
@@ -34,6 +42,10 @@ namespace Server {
 
 		// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
 		public void Configure(IApplicationBuilder app, IWebHostEnvironment env) {
+			app.UseForwardedHeaders(new ForwardedHeadersOptions {
+				ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto,
+			});
+
 			if (env.IsDevelopment()) {
 				app.UseDeveloperExceptionPage();
 				app.UseSwagger();