diff --git a/Jellyfin.Api/Controllers/ApiKeyController.cs b/Jellyfin.Api/Controllers/ApiKeyController.cs
index 0e28d4c474..bf973b8dd6 100644
--- a/Jellyfin.Api/Controllers/ApiKeyController.cs
+++ b/Jellyfin.Api/Controllers/ApiKeyController.cs
@@ -88,7 +88,7 @@ namespace Jellyfin.Api.Controllers
         [HttpDelete("Keys/{key}")]
         [Authorize(Policy = Policies.RequiresElevation)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
-        public ActionResult RevokeKey([FromRoute, Required] string? key)
+        public ActionResult RevokeKey([FromRoute, Required] string key)
         {
             _sessionManager.RevokeToken(key);
             return NoContent();
diff --git a/Jellyfin.Api/Controllers/AudioController.cs b/Jellyfin.Api/Controllers/AudioController.cs
index 3bec437200..219577955b 100644
--- a/Jellyfin.Api/Controllers/AudioController.cs
+++ b/Jellyfin.Api/Controllers/AudioController.cs
@@ -91,7 +91,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         public async Task<ActionResult> GetAudioStream(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? container,
+            [FromRoute] string? container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
diff --git a/Jellyfin.Api/Controllers/ConfigurationController.cs b/Jellyfin.Api/Controllers/ConfigurationController.cs
index 5fd4c712a7..7596af39b9 100644
--- a/Jellyfin.Api/Controllers/ConfigurationController.cs
+++ b/Jellyfin.Api/Controllers/ConfigurationController.cs
@@ -73,7 +73,7 @@ namespace Jellyfin.Api.Controllers
         /// <returns>Configuration.</returns>
         [HttpGet("Configuration/{key}")]
         [ProducesResponseType(StatusCodes.Status200OK)]
-        public ActionResult<object> GetNamedConfiguration([FromRoute, Required] string? key)
+        public ActionResult<object> GetNamedConfiguration([FromRoute, Required] string key)
         {
             return _configurationManager.GetConfiguration(key);
         }
@@ -87,7 +87,7 @@ namespace Jellyfin.Api.Controllers
         [HttpPost("Configuration/{key}")]
         [Authorize(Policy = Policies.RequiresElevation)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
-        public async Task<ActionResult> UpdateNamedConfiguration([FromRoute, Required] string? key)
+        public async Task<ActionResult> UpdateNamedConfiguration([FromRoute, Required] string key)
         {
             var configurationType = _configurationManager.GetConfigurationType(key);
             var configuration = await JsonSerializer.DeserializeAsync(Request.Body, configurationType, _serializerOptions).ConfigureAwait(false);
diff --git a/Jellyfin.Api/Controllers/DisplayPreferencesController.cs b/Jellyfin.Api/Controllers/DisplayPreferencesController.cs
index 6bb7b19105..5d22ba665d 100644
--- a/Jellyfin.Api/Controllers/DisplayPreferencesController.cs
+++ b/Jellyfin.Api/Controllers/DisplayPreferencesController.cs
@@ -43,7 +43,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         [SuppressMessage("Microsoft.Performance", "CA1801:ReviewUnusedParameters", MessageId = "displayPreferencesId", Justification = "Imported from ServiceStack")]
         public ActionResult<DisplayPreferencesDto> GetDisplayPreferences(
-            [FromRoute, Required] string? displayPreferencesId,
+            [FromRoute, Required] string displayPreferencesId,
             [FromQuery] [Required] Guid userId,
             [FromQuery] [Required] string? client)
         {
@@ -97,7 +97,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         [SuppressMessage("Microsoft.Performance", "CA1801:ReviewUnusedParameters", MessageId = "displayPreferencesId", Justification = "Imported from ServiceStack")]
         public ActionResult UpdateDisplayPreferences(
-            [FromRoute, Required] string? displayPreferencesId,
+            [FromRoute, Required] string displayPreferencesId,
             [FromQuery, Required] Guid userId,
             [FromQuery, Required] string? client,
             [FromBody, Required] DisplayPreferencesDto displayPreferences)
diff --git a/Jellyfin.Api/Controllers/DynamicHlsController.cs b/Jellyfin.Api/Controllers/DynamicHlsController.cs
index d81c7996e0..6b45d7944f 100644
--- a/Jellyfin.Api/Controllers/DynamicHlsController.cs
+++ b/Jellyfin.Api/Controllers/DynamicHlsController.cs
@@ -168,7 +168,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         public async Task<ActionResult> GetMasterHlsVideoPlaylist(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? container,
+            [FromRoute, Required] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -335,7 +335,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         public async Task<ActionResult> GetMasterHlsAudioPlaylist(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? container,
+            [FromRoute, Required] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -344,7 +344,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? segmentContainer,
             [FromQuery] int? segmentLength,
             [FromQuery] int? minSegments,
-            [FromQuery, Required] string? mediaSourceId,
+            [FromQuery, Required] string mediaSourceId,
             [FromQuery] string? deviceId,
             [FromQuery] string? audioCodec,
             [FromQuery] bool? enableAutoStreamCopy,
diff --git a/Jellyfin.Api/Controllers/ImageByNameController.cs b/Jellyfin.Api/Controllers/ImageByNameController.cs
index 5285905365..56b72eb600 100644
--- a/Jellyfin.Api/Controllers/ImageByNameController.cs
+++ b/Jellyfin.Api/Controllers/ImageByNameController.cs
@@ -65,7 +65,7 @@ namespace Jellyfin.Api.Controllers
         [Produces(MediaTypeNames.Application.Octet)]
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
-        public ActionResult<FileStreamResult> GetGeneralImage([FromRoute, Required] string? name, [FromRoute, Required] string? type)
+        public ActionResult<FileStreamResult> GetGeneralImage([FromRoute, Required] string name, [FromRoute, Required] string type)
         {
             var filename = string.Equals(type, "primary", StringComparison.OrdinalIgnoreCase)
                 ? "folder"
@@ -111,8 +111,8 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         public ActionResult<FileStreamResult> GetRatingImage(
-            [FromRoute, Required] string? theme,
-            [FromRoute, Required] string? name)
+            [FromRoute, Required] string theme,
+            [FromRoute, Required] string name)
         {
             return GetImageFile(_applicationPaths.RatingsPath, theme, name);
         }
@@ -144,8 +144,8 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         public ActionResult<FileStreamResult> GetMediaInfoImage(
-            [FromRoute, Required] string? theme,
-            [FromRoute, Required] string? name)
+            [FromRoute, Required] string theme,
+            [FromRoute, Required] string name)
         {
             return GetImageFile(_applicationPaths.MediaInfoImagesPath, theme, name);
         }
diff --git a/Jellyfin.Api/Controllers/ImageController.cs b/Jellyfin.Api/Controllers/ImageController.cs
index 453da57118..978d2eefac 100644
--- a/Jellyfin.Api/Controllers/ImageController.cs
+++ b/Jellyfin.Api/Controllers/ImageController.cs
@@ -93,7 +93,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> PostUserImage(
             [FromRoute, Required] Guid userId,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] int? index = null)
+            [FromRoute] int? index = null)
         {
             if (!RequestHelpers.AssertCanUpdateUser(_authContext, HttpContext.Request, userId, true))
             {
@@ -140,7 +140,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult DeleteUserImage(
             [FromRoute, Required] Guid userId,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] int? index = null)
+            [FromRoute] int? index = null)
         {
             if (!RequestHelpers.AssertCanUpdateUser(_authContext, HttpContext.Request, userId, true))
             {
@@ -178,7 +178,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> DeleteItemImage(
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var item = _libraryManager.GetItemById(itemId);
             if (item == null)
@@ -208,7 +208,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> SetItemImage(
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var item = _libraryManager.GetItemById(itemId);
             if (item == null)
@@ -355,8 +355,8 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetItemImage(
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] int? maxWidth,
-            [FromRoute, Required] int? maxHeight,
+            [FromQuery] int? maxWidth,
+            [FromQuery] int? maxHeight,
             [FromQuery] int? width,
             [FromQuery] int? height,
             [FromQuery] int? quality,
@@ -369,7 +369,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var item = _libraryManager.GetItemById(itemId);
             if (item == null)
@@ -433,8 +433,8 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetItemImage2(
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] int? maxWidth,
-            [FromRoute, Required] int? maxHeight,
+            [FromRoute, Required] int maxWidth,
+            [FromRoute, Required] int maxHeight,
             [FromQuery] int? width,
             [FromQuery] int? height,
             [FromQuery] int? quality,
@@ -442,12 +442,12 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] bool? cropWhitespace,
             [FromRoute, Required] string format,
             [FromQuery] bool? addPlayedIndicator,
-            [FromRoute, Required] double? percentPlayed,
-            [FromRoute, Required] int? unplayedCount,
+            [FromRoute, Required] double percentPlayed,
+            [FromRoute, Required] int unplayedCount,
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute, Required] int imageIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
             if (item == null)
@@ -504,19 +504,19 @@ namespace Jellyfin.Api.Controllers
         /// A <see cref="FileStreamResult"/> containing the file stream on success,
         /// or a <see cref="NotFoundResult"/> if item not found.
         /// </returns>
-        [HttpGet("Artists/{name}/Images/{imageType}/{imageIndex?}")]
-        [HttpHead("Artists/{name}/Images/{imageType}/{imageIndex?}", Name = "HeadArtistImage")]
+        [HttpGet("Artists/{name}/Images/{imageType}/{imageIndex}")]
+        [HttpHead("Artists/{name}/Images/{imageType}/{imageIndex}", Name = "HeadArtistImage")]
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         public async Task<ActionResult> GetArtistImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] string tag,
-            [FromRoute, Required] string format,
-            [FromRoute, Required] int? maxWidth,
-            [FromRoute, Required] int? maxHeight,
-            [FromRoute, Required] double? percentPlayed,
-            [FromRoute, Required] int? unplayedCount,
+            [FromQuery] string tag,
+            [FromQuery] string format,
+            [FromQuery] int? maxWidth,
+            [FromQuery] int? maxHeight,
+            [FromQuery] double? percentPlayed,
+            [FromQuery] int? unplayedCount,
             [FromQuery] int? width,
             [FromQuery] int? height,
             [FromQuery] int? quality,
@@ -525,7 +525,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute, Required] int imageIndex)
         {
             var item = _libraryManager.GetArtist(name);
             if (item == null)
@@ -582,19 +582,19 @@ namespace Jellyfin.Api.Controllers
         /// A <see cref="FileStreamResult"/> containing the file stream on success,
         /// or a <see cref="NotFoundResult"/> if item not found.
         /// </returns>
-        [HttpGet("Genres/{name}/Images/{imageType}/{imageIndex?}")]
+        [HttpGet("Genres/{name}/Images/{imageType}/{imageIndex}")]
         [HttpHead("Genres/{name}/Images/{imageType}/{imageIndex?}", Name = "HeadGenreImage")]
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         public async Task<ActionResult> GetGenreImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] string tag,
-            [FromRoute, Required] string format,
-            [FromRoute, Required] int? maxWidth,
-            [FromRoute, Required] int? maxHeight,
-            [FromRoute, Required] double? percentPlayed,
-            [FromRoute, Required] int? unplayedCount,
+            [FromQuery] string tag,
+            [FromQuery] string format,
+            [FromQuery] int? maxWidth,
+            [FromQuery] int? maxHeight,
+            [FromQuery] double? percentPlayed,
+            [FromQuery] int? unplayedCount,
             [FromQuery] int? width,
             [FromQuery] int? height,
             [FromQuery] int? quality,
@@ -603,7 +603,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var item = _libraryManager.GetGenre(name);
             if (item == null)
@@ -667,12 +667,12 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetMusicGenreImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] string tag,
-            [FromRoute, Required] string format,
-            [FromRoute, Required] int? maxWidth,
-            [FromRoute, Required] int? maxHeight,
-            [FromRoute, Required] double? percentPlayed,
-            [FromRoute, Required] int? unplayedCount,
+            [FromQuery] string tag,
+            [FromQuery] string format,
+            [FromQuery] int? maxWidth,
+            [FromQuery] int? maxHeight,
+            [FromQuery] double? percentPlayed,
+            [FromQuery] int? unplayedCount,
             [FromQuery] int? width,
             [FromQuery] int? height,
             [FromQuery] int? quality,
@@ -681,7 +681,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var item = _libraryManager.GetMusicGenre(name);
             if (item == null)
@@ -745,12 +745,12 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetPersonImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromRoute, Required] string tag,
-            [FromRoute, Required] string format,
-            [FromRoute, Required] int? maxWidth,
-            [FromRoute, Required] int? maxHeight,
-            [FromRoute, Required] double? percentPlayed,
-            [FromRoute, Required] int? unplayedCount,
+            [FromQuery] string tag,
+            [FromQuery] string format,
+            [FromQuery] int? maxWidth,
+            [FromQuery] int? maxHeight,
+            [FromQuery] double? percentPlayed,
+            [FromQuery] int? unplayedCount,
             [FromQuery] int? width,
             [FromQuery] int? height,
             [FromQuery] int? quality,
@@ -759,7 +759,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var item = _libraryManager.GetPerson(name);
             if (item == null)
@@ -837,7 +837,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var item = _libraryManager.GetStudio(name);
             if (item == null)
@@ -915,7 +915,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? blur,
             [FromQuery] string? backgroundColor,
             [FromQuery] string? foregroundLayer,
-            [FromRoute, Required] int? imageIndex = null)
+            [FromRoute] int? imageIndex = null)
         {
             var user = _userManager.GetUserById(userId);
             if (user == null)
diff --git a/Jellyfin.Api/Controllers/InstantMixController.cs b/Jellyfin.Api/Controllers/InstantMixController.cs
index 01bfbba4e7..07fed97642 100644
--- a/Jellyfin.Api/Controllers/InstantMixController.cs
+++ b/Jellyfin.Api/Controllers/InstantMixController.cs
@@ -175,7 +175,7 @@ namespace Jellyfin.Api.Controllers
         [HttpGet("MusicGenres/{name}/InstantMix")]
         [ProducesResponseType(StatusCodes.Status200OK)]
         public ActionResult<QueryResult<BaseItemDto>> GetInstantMixFromMusicGenre(
-            [FromRoute, Required] string? name,
+            [FromRoute, Required] string name,
             [FromQuery] Guid? userId,
             [FromQuery] int? limit,
             [FromQuery] string? fields,
diff --git a/Jellyfin.Api/Controllers/ItemsController.cs b/Jellyfin.Api/Controllers/ItemsController.cs
index 06ab176b2f..652c4689d0 100644
--- a/Jellyfin.Api/Controllers/ItemsController.cs
+++ b/Jellyfin.Api/Controllers/ItemsController.cs
@@ -145,7 +145,7 @@ namespace Jellyfin.Api.Controllers
         [HttpGet("Users/{uId}/Items", Name = "GetItems_2")]
         [ProducesResponseType(StatusCodes.Status200OK)]
         public ActionResult<QueryResult<BaseItemDto>> GetItems(
-            [FromRoute, Required] Guid? uId,
+            [FromRoute] Guid? uId,
             [FromQuery] Guid? userId,
             [FromQuery] string? maxOfficialRating,
             [FromQuery] bool? hasThemeSong,
diff --git a/Jellyfin.Api/Controllers/LibraryController.cs b/Jellyfin.Api/Controllers/LibraryController.cs
index f1f52961d2..4adaee8525 100644
--- a/Jellyfin.Api/Controllers/LibraryController.cs
+++ b/Jellyfin.Api/Controllers/LibraryController.cs
@@ -555,7 +555,7 @@ namespace Jellyfin.Api.Controllers
         [HttpPost("Library/Movies/Updated")]
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
-        public ActionResult PostUpdatedMovies([FromRoute, Required] string? tmdbId, [FromRoute, Required] string? imdbId)
+        public ActionResult PostUpdatedMovies([FromQuery] string? tmdbId, [FromQuery] string? imdbId)
         {
             var movies = _libraryManager.GetItemList(new InternalItemsQuery
             {
diff --git a/Jellyfin.Api/Controllers/LiveTvController.cs b/Jellyfin.Api/Controllers/LiveTvController.cs
index 8678844d23..c323957057 100644
--- a/Jellyfin.Api/Controllers/LiveTvController.cs
+++ b/Jellyfin.Api/Controllers/LiveTvController.cs
@@ -935,7 +935,7 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         [Obsolete("This endpoint is obsolete.")]
-        public ActionResult<BaseItemDto> GetRecordingGroup([FromRoute, Required] Guid? groupId)
+        public ActionResult<BaseItemDto> GetRecordingGroup([FromRoute, Required] Guid groupId)
         {
             return NotFound();
         }
diff --git a/Jellyfin.Api/Controllers/PackageController.cs b/Jellyfin.Api/Controllers/PackageController.cs
index 9509f8708b..eaf56aa563 100644
--- a/Jellyfin.Api/Controllers/PackageController.cs
+++ b/Jellyfin.Api/Controllers/PackageController.cs
@@ -44,7 +44,7 @@ namespace Jellyfin.Api.Controllers
         [HttpGet("Packages/{name}")]
         [ProducesResponseType(StatusCodes.Status200OK)]
         public async Task<ActionResult<PackageInfo>> GetPackageInfo(
-            [FromRoute, Required] string? name,
+            [FromRoute, Required] string name,
             [FromQuery] string? assemblyGuid)
         {
             var packages = await _installationManager.GetAvailablePackages().ConfigureAwait(false);
@@ -85,7 +85,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         [Authorize(Policy = Policies.RequiresElevation)]
         public async Task<ActionResult> InstallPackage(
-            [FromRoute, Required] string? name,
+            [FromRoute, Required] string name,
             [FromQuery] string? assemblyGuid,
             [FromQuery] string? version)
         {
diff --git a/Jellyfin.Api/Controllers/PlaylistsController.cs b/Jellyfin.Api/Controllers/PlaylistsController.cs
index 69e0b8e07b..1e95bd2b38 100644
--- a/Jellyfin.Api/Controllers/PlaylistsController.cs
+++ b/Jellyfin.Api/Controllers/PlaylistsController.cs
@@ -103,8 +103,8 @@ namespace Jellyfin.Api.Controllers
         [HttpPost("{playlistId}/Items/{itemId}/Move/{newIndex}")]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public async Task<ActionResult> MoveItem(
-            [FromRoute, Required] string? playlistId,
-            [FromRoute, Required] string? itemId,
+            [FromRoute, Required] string playlistId,
+            [FromRoute, Required] string itemId,
             [FromRoute, Required] int newIndex)
         {
             await _playlistManager.MoveItemAsync(playlistId, itemId, newIndex).ConfigureAwait(false);
@@ -120,7 +120,7 @@ namespace Jellyfin.Api.Controllers
         /// <returns>An <see cref="NoContentResult"/> on success.</returns>
         [HttpDelete("{playlistId}/Items")]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
-        public async Task<ActionResult> RemoveFromPlaylist([FromRoute, Required] string? playlistId, [FromQuery] string? entryIds)
+        public async Task<ActionResult> RemoveFromPlaylist([FromRoute, Required] string playlistId, [FromQuery] string? entryIds)
         {
             await _playlistManager.RemoveFromPlaylistAsync(playlistId, RequestHelpers.Split(entryIds, ',', true)).ConfigureAwait(false);
             return NoContent();
@@ -144,14 +144,14 @@ namespace Jellyfin.Api.Controllers
         [HttpGet("{playlistId}/Items")]
         public ActionResult<QueryResult<BaseItemDto>> GetPlaylistItems(
             [FromRoute, Required] Guid playlistId,
-            [FromRoute, Required] Guid userId,
-            [FromRoute, Required] int? startIndex,
-            [FromRoute, Required] int? limit,
-            [FromRoute, Required] string? fields,
-            [FromRoute, Required] bool? enableImages,
-            [FromRoute, Required] bool? enableUserData,
-            [FromRoute, Required] int? imageTypeLimit,
-            [FromRoute, Required] string? enableImageTypes)
+            [FromQuery, Required] Guid userId,
+            [FromQuery] int? startIndex,
+            [FromQuery] int? limit,
+            [FromQuery] string? fields,
+            [FromQuery] bool? enableImages,
+            [FromQuery] bool? enableUserData,
+            [FromQuery] int? imageTypeLimit,
+            [FromQuery] string? enableImageTypes)
         {
             var playlist = (Playlist)_libraryManager.GetItemById(playlistId);
             if (playlist == null)
diff --git a/Jellyfin.Api/Controllers/PluginsController.cs b/Jellyfin.Api/Controllers/PluginsController.cs
index 342b0328d2..0f8ceba291 100644
--- a/Jellyfin.Api/Controllers/PluginsController.cs
+++ b/Jellyfin.Api/Controllers/PluginsController.cs
@@ -172,7 +172,7 @@ namespace Jellyfin.Api.Controllers
         [Obsolete("This endpoint should not be used.")]
         [HttpPost("RegistrationRecords/{name}")]
         [ProducesResponseType(StatusCodes.Status200OK)]
-        public ActionResult<MBRegistrationRecord> GetRegistrationStatus([FromRoute, Required] string? name)
+        public ActionResult<MBRegistrationRecord> GetRegistrationStatus([FromRoute, Required] string name)
         {
             return new MBRegistrationRecord
             {
@@ -194,7 +194,7 @@ namespace Jellyfin.Api.Controllers
         [Obsolete("Paid plugins are not supported")]
         [HttpGet("Registrations/{name}")]
         [ProducesResponseType(StatusCodes.Status501NotImplemented)]
-        public ActionResult GetRegistration([FromRoute, Required] string? name)
+        public ActionResult GetRegistration([FromRoute, Required] string name)
         {
             // TODO Once we have proper apps and plugins and decide to break compatibility with paid plugins,
             // delete all these registration endpoints. They are only kept for compatibility.
diff --git a/Jellyfin.Api/Controllers/ScheduledTasksController.cs b/Jellyfin.Api/Controllers/ScheduledTasksController.cs
index 3206f27347..ab7920895b 100644
--- a/Jellyfin.Api/Controllers/ScheduledTasksController.cs
+++ b/Jellyfin.Api/Controllers/ScheduledTasksController.cs
@@ -71,7 +71,7 @@ namespace Jellyfin.Api.Controllers
         [HttpGet("{taskId}")]
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
-        public ActionResult<TaskInfo> GetTask([FromRoute, Required] string? taskId)
+        public ActionResult<TaskInfo> GetTask([FromRoute, Required] string taskId)
         {
             var task = _taskManager.ScheduledTasks.FirstOrDefault(i =>
                 string.Equals(i.Id, taskId, StringComparison.OrdinalIgnoreCase));
@@ -94,7 +94,7 @@ namespace Jellyfin.Api.Controllers
         [HttpPost("Running/{taskId}")]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
-        public ActionResult StartTask([FromRoute, Required] string? taskId)
+        public ActionResult StartTask([FromRoute, Required] string taskId)
         {
             var task = _taskManager.ScheduledTasks.FirstOrDefault(o =>
                 o.Id.Equals(taskId, StringComparison.OrdinalIgnoreCase));
@@ -118,7 +118,7 @@ namespace Jellyfin.Api.Controllers
         [HttpDelete("Running/{taskId}")]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
-        public ActionResult StopTask([FromRoute, Required] string? taskId)
+        public ActionResult StopTask([FromRoute, Required] string taskId)
         {
             var task = _taskManager.ScheduledTasks.FirstOrDefault(o =>
                 o.Id.Equals(taskId, StringComparison.OrdinalIgnoreCase));
@@ -144,7 +144,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         public ActionResult UpdateTask(
-            [FromRoute, Required] string? taskId,
+            [FromRoute, Required] string taskId,
             [FromBody, Required] TaskTriggerInfo[] triggerInfos)
         {
             var task = _taskManager.ScheduledTasks.FirstOrDefault(o =>
diff --git a/Jellyfin.Api/Controllers/SessionController.cs b/Jellyfin.Api/Controllers/SessionController.cs
index cff7c15019..3bb9b11d92 100644
--- a/Jellyfin.Api/Controllers/SessionController.cs
+++ b/Jellyfin.Api/Controllers/SessionController.cs
@@ -125,10 +125,10 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult DisplayContent(
-            [FromRoute, Required] string? sessionId,
-            [FromQuery, Required] string? itemType,
-            [FromQuery, Required] string? itemId,
-            [FromQuery, Required] string? itemName)
+            [FromRoute, Required] string sessionId,
+            [FromQuery, Required] string itemType,
+            [FromQuery, Required] string itemId,
+            [FromQuery, Required] string itemName)
         {
             var command = new BrowseRequest
             {
@@ -159,7 +159,7 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult Play(
-            [FromRoute, Required] string? sessionId,
+            [FromRoute, Required] string sessionId,
             [FromQuery] Guid[] itemIds,
             [FromQuery] long? startPositionTicks,
             [FromQuery] PlayCommand playCommand)
@@ -187,11 +187,11 @@ namespace Jellyfin.Api.Controllers
         /// <param name="playstateRequest">The <see cref="PlaystateRequest"/>.</param>
         /// <response code="204">Playstate command sent to session.</response>
         /// <returns>A <see cref="NoContentResult"/>.</returns>
-        [HttpPost("Sessions/{sessionId}/Playing/{command}")]
+        [HttpPost("Sessions/{sessionId}/Playing")]
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult SendPlaystateCommand(
-            [FromRoute, Required] string? sessionId,
+            [FromRoute, Required] string sessionId,
             [FromBody] PlaystateRequest playstateRequest)
         {
             _sessionManager.SendPlaystateCommand(
@@ -214,8 +214,8 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult SendSystemCommand(
-            [FromRoute, Required] string? sessionId,
-            [FromRoute, Required] string? command)
+            [FromRoute, Required] string sessionId,
+            [FromRoute, Required] string command)
         {
             var name = command;
             if (Enum.TryParse(name, true, out GeneralCommandType commandType))
@@ -246,8 +246,8 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult SendGeneralCommand(
-            [FromRoute, Required] string? sessionId,
-            [FromRoute, Required] string? command)
+            [FromRoute, Required] string sessionId,
+            [FromRoute, Required] string command)
         {
             var currentSession = RequestHelpers.GetSession(_sessionManager, _authContext, Request);
 
@@ -273,7 +273,7 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult SendFullGeneralCommand(
-            [FromRoute, Required] string? sessionId,
+            [FromRoute, Required] string sessionId,
             [FromBody, Required] GeneralCommand command)
         {
             var currentSession = RequestHelpers.GetSession(_sessionManager, _authContext, Request);
@@ -307,8 +307,8 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult SendMessageCommand(
-            [FromRoute, Required] string? sessionId,
-            [FromQuery, Required] string? text,
+            [FromRoute, Required] string sessionId,
+            [FromQuery, Required] string text,
             [FromQuery, Required] string? header,
             [FromQuery] long? timeoutMs)
         {
@@ -335,7 +335,7 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult AddUserToSession(
-            [FromRoute, Required] string? sessionId,
+            [FromRoute, Required] string sessionId,
             [FromRoute, Required] Guid userId)
         {
             _sessionManager.AddAdditionalUser(sessionId, userId);
@@ -353,7 +353,7 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult RemoveUserFromSession(
-            [FromRoute, Required] string? sessionId,
+            [FromRoute, Required] string sessionId,
             [FromRoute, Required] Guid userId)
         {
             _sessionManager.RemoveAdditionalUser(sessionId, userId);
diff --git a/Jellyfin.Api/Controllers/SubtitleController.cs b/Jellyfin.Api/Controllers/SubtitleController.cs
index 2c82b54238..09704d484f 100644
--- a/Jellyfin.Api/Controllers/SubtitleController.cs
+++ b/Jellyfin.Api/Controllers/SubtitleController.cs
@@ -113,7 +113,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         public async Task<ActionResult<IEnumerable<RemoteSubtitleInfo>>> SearchRemoteSubtitles(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? language,
+            [FromRoute, Required] string language,
             [FromQuery] bool? isPerfectMatch)
         {
             var video = (Video)_libraryManager.GetItemById(itemId);
@@ -133,7 +133,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public async Task<ActionResult> DownloadRemoteSubtitles(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? subtitleId)
+            [FromRoute, Required] string subtitleId)
         {
             var video = (Video)_libraryManager.GetItemById(itemId);
 
@@ -162,7 +162,7 @@ namespace Jellyfin.Api.Controllers
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status200OK)]
         [Produces(MediaTypeNames.Application.Octet)]
-        public async Task<ActionResult> GetRemoteSubtitles([FromRoute, Required] string? id)
+        public async Task<ActionResult> GetRemoteSubtitles([FromRoute, Required] string id)
         {
             var result = await _subtitleManager.GetRemoteSubtitles(id, CancellationToken.None).ConfigureAwait(false);
 
@@ -187,13 +187,13 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         public async Task<ActionResult> GetSubtitle(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? mediaSourceId,
+            [FromRoute, Required] string mediaSourceId,
             [FromRoute, Required] int index,
-            [FromRoute, Required] string? format,
+            [FromRoute, Required] string format,
             [FromQuery] long? endPositionTicks,
             [FromQuery] bool copyTimestamps = false,
             [FromQuery] bool addVttTimeMap = false,
-            [FromRoute, Required] long startPositionTicks = 0)
+            [FromRoute] long startPositionTicks = 0)
         {
             if (string.Equals(format, "js", StringComparison.OrdinalIgnoreCase))
             {
@@ -255,7 +255,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetSubtitlePlaylist(
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] int index,
-            [FromRoute, Required] string? mediaSourceId,
+            [FromRoute, Required] string mediaSourceId,
             [FromQuery, Required] int segmentLength)
         {
             var item = (Video)_libraryManager.GetItemById(itemId);
diff --git a/Jellyfin.Api/Controllers/TvShowsController.cs b/Jellyfin.Api/Controllers/TvShowsController.cs
index f463ab8894..b9c3bd1e72 100644
--- a/Jellyfin.Api/Controllers/TvShowsController.cs
+++ b/Jellyfin.Api/Controllers/TvShowsController.cs
@@ -194,8 +194,8 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         public ActionResult<QueryResult<BaseItemDto>> GetEpisodes(
-            [FromRoute, Required] string? seriesId,
-            [FromQuery, Required] Guid? userId,
+            [FromRoute, Required] string seriesId,
+            [FromQuery] Guid? userId,
             [FromQuery] string? fields,
             [FromQuery] int? season,
             [FromQuery] string? seasonId,
@@ -317,8 +317,8 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         public ActionResult<QueryResult<BaseItemDto>> GetSeasons(
-            [FromRoute, Required] string? seriesId,
-            [FromQuery, Required] Guid? userId,
+            [FromRoute, Required] string seriesId,
+            [FromQuery] Guid? userId,
             [FromQuery] string? fields,
             [FromQuery] bool? isSpecialSeason,
             [FromQuery] bool? isMissing,
diff --git a/Jellyfin.Api/Controllers/UniversalAudioController.cs b/Jellyfin.Api/Controllers/UniversalAudioController.cs
index f7f2d01748..a3cb7718c4 100644
--- a/Jellyfin.Api/Controllers/UniversalAudioController.cs
+++ b/Jellyfin.Api/Controllers/UniversalAudioController.cs
@@ -94,7 +94,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status302Found)]
         public async Task<ActionResult> GetUniversalAudioStream(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? container,
+            [FromRoute] string? container,
             [FromQuery] string? mediaSourceId,
             [FromQuery] string? deviceId,
             [FromQuery] Guid? userId,
diff --git a/Jellyfin.Api/Controllers/VideosController.cs b/Jellyfin.Api/Controllers/VideosController.cs
index 5c65399cb8..f732529c9f 100644
--- a/Jellyfin.Api/Controllers/VideosController.cs
+++ b/Jellyfin.Api/Controllers/VideosController.cs
@@ -332,7 +332,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         public async Task<ActionResult> GetVideoStream(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string? container,
+            [FromRoute] string? container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,