private async Task <(byte[], long)> GetAssemblyForSpecification(string specificationId, string etag)
        {
            Stopwatch assemblyLookupStopwatch = Stopwatch.StartNew();

            byte[] assembly = await _assemblyService.GetAssemblyForSpecification(specificationId, etag);

            assemblyLookupStopwatch.Stop();

            return(assembly, assemblyLookupStopwatch.ElapsedMilliseconds);
        }