Add missing CustomHeaderAttribute

Author: imclint21

src/Initium/Attributes/CustomHeaderAttribute.cs

@@ -0,0 +1,8 @@
+namespace Initium.Attributes;
+
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true)]
+public class CustomHeaderAttribute(string headerName, string headerValue) : Attribute
+{
+	public string HeaderName { get; } = headerName;
+	public string HeaderValue { get; } = headerValue;
+}

src/Initium/Controllers/ApiController.cs

@@ -15,7 +15,7 @@ namespace Initium.Controllers;
 [TypeFilter(typeof(ApiResponseFilter))]
 [TypeFilter(typeof(LoggingFilter))]
 [TypeFilter(typeof(ImplicitValidationFilter))]
-[TypeFilter(typeof(CustomHeaderFilter))]
+// [TypeFilter(typeof(CustomHeaderFilter))]
 public abstract class ApiController : BaseController;
 
 /// <summary>

src/Initium/Filters/CustomHeaderFilter.cs

@@ -0,0 +1,17 @@
+using Initium.Attributes;
+using Microsoft.AspNetCore.Mvc.Filters;
+
+namespace Initium.Filters;
+
+internal class CustomHeaderFilter : IActionFilter
+{
+	public void OnActionExecuting(ActionExecutingContext context)
+	{
+	}
+	
+	public void OnActionExecuted(ActionExecutedContext context) =>
+		context.ActionDescriptor.EndpointMetadata
+			.OfType<CustomHeaderAttribute>()
+			.ToList()
+			.ForEach(customHeader => context.HttpContext.Response.Headers[customHeader.HeaderName] = customHeader.HeaderValue);
+}