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

Laurence Rowe l at lrowe.co.uk
Mon Jun 7 19:47:32 CEST 2010

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:

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.


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