namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
{
    public abstract class FrameHeaders : IHeaderDictionary, ICollection<KeyValuePair<string, StringValues>>, IDictionary<string, StringValues>, IEnumerable, IEnumerable<KeyValuePair<string, StringValues>>
    {
        protected virtual bool TryGetValueFast(string key, out StringValues value);
    }
}