please add a function that does Header Field Normalisation
vanHoesel opened this issue · comments
In order to make comparison of two Header Field values more convenient (and correct) it would be great to have a normalisation function in HTTP::Headers, like:
my $normalized_value = $h->normalized_header( 'accept_language');
Normalisation is mentioned in RFC 7234 §4.1 Calculating Secondary Keys with Vary. And could involve:
- adding/removing whitespace
- combining fields, for multi value fields
- reordering fields
- capitalisation
However, re-ordering and capitalisation can be Header Field dependent and should not break semantics This requires a lot of care, knowing how certain HTTP-Header Fields south to be treated.
NOTE: bare in mind that normalisation is only for display or comparison, I would strongly disagree to change the headers, even though it might semantically totally right.
please close #60
Great, thanks a lot for reformulating the issue! It would be really great to have in there!