Using varnish to cache remote content

Traian Bratucu traian.bratucu at
Wed Mar 30 08:51:43 CEST 2011

You cannot do that with varnish, or with anything else :)
From: varnish-misc-bounces at [mailto:varnish-misc-bounces at] On Behalf Of Ronny Östman
Sent: Wednesday, March 30, 2011 8:35 AM
To: varnish-misc at
Subject: Using varnish to cache remote content


This might be a stupid question since I've searched alot and haven't really found the answer..

Anyway, I have a varnish set up caching requests to my backend the way I want it to and it works great
for all content that my backend provides.

The problem I am having is caching content from remote sources.. I'm not sure if this is really possible since
the request may not go through varnish.. i guess?

To further illustrate my question, here's an example of how it might look:

GET - Domain:
GET main.css - Domain:
GET hello.jpg - Domain:
GET anypicture.png - Domain:
GET foo.js - Domain:

In this example, is it possible to have my varnish cache those "remote" requests as well? I can set up backends
for those remote domains and force varnish to use them instead of my own backend but I can't seem to find a
way to have varnish do this "dynamically". The requests doesnt seem to go through my varnish according to
varnishlog and this makes it hard to set backend depending on host.

Am I trying to accomplish something impossible here?


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