public static void AsCacheable(this HttpContext ctx, TimeSpan span, string customHeader = null) => ctx.AddResponseExpirationHeader(span, customHeader);
public static void AsCacheable(this HttpContext ctx, DateTime absoluteExpiration, string customHeader = null)
{
var span = absoluteExpiration - DateTime.UtcNow;
ctx.AddResponseExpirationHeader(span, customHeader);
}
public static void AsCacheable(this HttpContext ctx, int seconds, string customHeader = null)
{
var span = TimeSpan.FromSeconds(seconds);
ctx.AddResponseExpirationHeader(span, customHeader);
}