Fix redirection

Jellyfin.Server/Middleware/BaseUrlRedirectionMiddleware.cs

@@ -44,7 +44,11 @@ namespace Jellyfin.Server.Middleware
             var localPath = httpContext.Request.Path.ToString();
             var baseUrlPrefix = serverConfigurationManager.Configuration.BaseUrl;
 
-            if (!localPath.StartsWith(baseUrlPrefix, StringComparison.OrdinalIgnoreCase))
+            if (string.Equals(localPath, baseUrlPrefix + "/", StringComparison.OrdinalIgnoreCase)
+                || string.Equals(localPath, baseUrlPrefix, StringComparison.OrdinalIgnoreCase)
+                || string.Equals(localPath, "/", StringComparison.OrdinalIgnoreCase)
+                || string.IsNullOrEmpty(localPath)
+                || !localPath.StartsWith(baseUrlPrefix, StringComparison.OrdinalIgnoreCase))
             {
                 // Always redirect back to the default path if the base prefix is invalid or missing
                 _logger.LogDebug("Normalizing an URL at {LocalPath}", localPath);

Jellyfin.Server/Startup.cs

@@ -93,11 +93,7 @@ namespace Jellyfin.Server
             IWebHostEnvironment env,
             IConfiguration appConfig)
         {
-            // Only add base url redirection if a base url is set.
-            if (!string.IsNullOrEmpty(_serverConfigurationManager.Configuration.BaseUrl))
-            {
-                app.UseBaseUrlRedirection();
-            }
+            app.UseBaseUrlRedirection();
 
             // Wrap rest of configuration so everything only listens on BaseUrl.
             app.Map(_serverConfigurationManager.Configuration.BaseUrl, mainApp =>