public static void WriteTrailingHeaders(this ValueHttpRequest request, TestHeadersSink headers)
 {
     foreach (KeyValuePair <string, List <string> > header in headers)
     {
         foreach (string headerValue in header.Value)
         {
             request.WriteTrailingHeader(header.Key, headerValue);
         }
     }
 }
 protected internal override void WriteTrailingHeader(int version, ReadOnlySpan <byte> name, ReadOnlySpan <byte> value)
 {
     ThrowIfDisposed(version);
     _request.WriteTrailingHeader(name, value);
 }