HeaderResolver.cs

public class HeaderResolver : IComponentResolver
{
    public int Order => -100;

    private readonly IApiPublishedContentCache _apiPublishedContentCache;

    public HeaderResolver(IApiPublishedContentCache apiPublishedContentCache)
    {
        _apiPublishedContentCache = apiPublishedContentCache;
    }

    public IPublishedContent ResolveContent(IPublishedContent content)
    {
        return _apiPublishedContentCache.GetByRoute("/site-data/page-frames/header/");
    }
}