[PATCH] Concatenate Set-Cookie headers before a call to vcl_fetch()

[Laurence Rowe]

On 6 June 2010 22:33, lee doolan <lee.doolan at volcanomail.com> wrote:
>
> Well, the 'Set-Cookie' header is unique amongst the headers of an HTTP
> response in the respect that it can occur multiple times.  VCL has no
> facility for looping over these headers and deciding which ones to
> remove and which ones to keep.

This is true for all headers. See:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2

"""
Multiple message-header fields with the same field-name MAY be present
in a message if and only if the entire field-value for that header
field is defined as a comma-separated list [i.e., #(values)]. It MUST
be possible to combine the multiple header fields into one
"field-name: field-value" pair, without changing the semantics of the
message, by appending each subsequent field-value to the first, each
separated by a comma. The order in which header fields with the same
field-name are received is therefore significant to the interpretation
of the combined field value, and thus a proxy MUST NOT change the
order of these field values when a message is forwarded.
"""

So it should be fine for a proxy like Varnish to combine the multiple
headers into a single header, no need for any special X-Set-Cookies.

Laurence