Optimal way to handle Vary on User-Agent

Guillaume Quintard guillaume at varnish-software.com
Fri Oct 13 12:31:19 UTC 2017

The user-agent is an abomination and needs to die.

Now, with that being said, I would rewrite the UA header, just to make sure
the backend doesn't use the original information.

You can have a look at https://github.com/varnishcache/varnish-devicedetect
for a vcl solution. Other solutions exist, obviously.

Guillaume Quintard

On Fri, Oct 13, 2017 at 2:19 PM, Pinakee BIswas <pinakee at waltzz.com> wrote:

> Hi,
> We are using Varnish 4.1.8 to cache and speed up our web delivery. Our
> page content varies based on following 3 device types:
>    1. Desktop
>    2. Mobile (doesn't matter whether android, iOS or windows)
>    3. Tablet
> As universally known, varying on User-Agent is quite bad for caching as
> there would be thousands of UA. Hence, would like to know a  solution based
> on following if possible in Varnish:
>    1. Normalize header User-Agent to only the 3 types mentioned above OR
>    2. Add a new normalized HTTP header for the above 3 types. Our backed
>    then Vary on the new HTTP header.
> Would appreciate if any solution could be provided for the above..
> Thanks,
> Pinakee
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