Re: Multiple header fields with the same field name - unwritten assumption about quoted commas in values?

[Julian Reschke <[e-mail]>]

On 2013-01-15 12:47, Piotr Dobrogost wrote:
> To summarize, from the point of view of http client library (see
> https://github.com/kennethreitz/requests/issues/741):
>
> - The safe approach is to not merge any header fields with the same field name.

Yes.

> - If merging, merge only those fields which are known to be safe to
> merge ie. those, which can be parsed after merging. Also, if the top
> most production in BNF specyfing field's value is #(values) it does
> NOT mean the field is safe for merging although this seems to be
> implied by the statement in the spec starting with "Multiple header
> fields with the same field name MUST NOT be sent (...)"

If a spec uses the list production but then doesn't allow proper parsing 
then that spec is buggy (such as Set-Cookie).

Best regards, Julian