Sitecore Custom Item Resolver

Item Resolver

public class MyCustomResolver : HttpRequestProcessor
{
    public override void Process(HttpRequestArgs args)
    {
        // Return if Sitecore has found the item
        if (Context.Item != null || Context.Database == null || args.Url.ItemPath.Length == 0) return;

        // If item not found
        var itemPath = args.Url.ItemPath; // The requested item path
   
        var context = Factory.GetDatabase("web");
        var item = context.GetItem("/"); // Business logic here to find the new item
   
        if (item != null)
        {
            Context.Item = item; // If the item is found return it
        }
    }
}

Web.config

<processor type="Sitecore.Pipelines.HttpRequest.ItemResolver, Sitecore.Kernel"/>
<processor type="MyProject.MyCustomResolver , MyProject" />