RequireHttp attribute allows redirecting back to HTTP after visiting a secured page. Enables mixing secured and unsecured pages in ASP.NET MVC.

RequireHttpAttribute.cs

/// <summary>
/// Forces a secured (HTTPS) request to be resent over HTTP
/// </summary>
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class RequireHttpAttribute : FilterAttribute, IAuthorizationFilter
{
    public virtual void OnAuthorization(AuthorizationContext filterContext)
    {
        if(filterContext == null)
        {
            throw new ArgumentNullException("filterContext");
        }
        if(!filterContext.HttpContext.Request.IsSecureConnection)
        {
            return;
        }

        HandleHttpsRequest(filterContext);
    }

    protected virtual void HandleHttpsRequest(AuthorizationContext filterContext)
    {
        if(!string.Equals(filterContext.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
        {
            // Only redirect GET requests
            return;
        }

        string url = "http://" + filterContext.HttpContext.Request.Url.Host + filterContext.HttpContext.Request.RawUrl;
        filterContext.Result = new RedirectResult(url);
    }
}