Added missing HEAD routes

Author: Bart Koelman

src/JsonApiDotNetCore/Controllers/JsonApiQueryController.cs

@@ -33,27 +33,31 @@ protected JsonApiQueryController(IJsonApiOptions options, IResourceGraph resourc
 
         /// <inheritdoc />
         [HttpGet]
+        [HttpHead]
         public override async Task<IActionResult> GetAsync(CancellationToken cancellationToken)
         {
             return await base.GetAsync(cancellationToken);
         }
 
         /// <inheritdoc />
         [HttpGet("{id}")]
+        [HttpHead("{id}")]
         public override async Task<IActionResult> GetAsync(TId id, CancellationToken cancellationToken)
         {
             return await base.GetAsync(id, cancellationToken);
         }
 
         /// <inheritdoc />
         [HttpGet("{id}/{relationshipName}")]
+        [HttpHead("{id}/{relationshipName}")]
         public override async Task<IActionResult> GetSecondaryAsync(TId id, string relationshipName, CancellationToken cancellationToken)
         {
             return await base.GetSecondaryAsync(id, relationshipName, cancellationToken);
         }
 
         /// <inheritdoc />
         [HttpGet("{id}/relationships/{relationshipName}")]
+        [HttpHead("{id}/relationships/{relationshipName}")]
         public override async Task<IActionResult> GetRelationshipAsync(TId id, string relationshipName, CancellationToken cancellationToken)
         {
             return await base.GetRelationshipAsync(id, relationshipName, cancellationToken);