Via

[Geoff Simmons]

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At the risk of bikeshedding via Via ...

On 3/19/14 10:06 PM, Poul-Henning Kamp wrote:
> 
> We append a Via header, if there is one already, that will come 
> first, and I belive Via is one of those headers where you should 
> process all to get the valid result.
> 
> Obviously, we can append to an existing Via header if we want that
> instead, but that would make it harder to remove just the Varnish
> Via again in VCL.

I haven't found a way to read the RFC in such a way that a Via header
should be added -- all of my attempted parsings say that a hop should
appended to an existing header. Unless of course I've missed it, or
unless they use the word "append" in an ambiguous way that encompasses
both meanings (which unfortunately I wouldn't rule out with this RFC).

That said, separate headers are indeed much easier to work with in
VCL, especially now that we have the header VMOD, which could
specifically target the Varnish Via (to remove it or change "varnish"
into a host name), or collect all the Vias into a single header, all
quite trivially.

Since this is getting into bike shed territory, I'd say it's easiest
to go with the separate header, with the option of changing it in VCL.


Best,
Geoff
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