// Returns false for invalid header name.
public static bool TryGet(ReadOnlySpan <byte> headerName, out HeaderDescriptor descriptor)
{
Debug.Assert(headerName.Length > 0);
KnownHeader?knownHeader = KnownHeaders.TryGetKnownHeader(headerName);
if (knownHeader != null)
{
descriptor = new HeaderDescriptor(knownHeader);
return(true);
}
if (!HttpRuleParser.IsToken(headerName))
{
descriptor = default(HeaderDescriptor);
return(false);
}
descriptor = new HeaderDescriptor(HttpRuleParser.GetTokenString(headerName));
return(true);
}