<font size="2"><font face="georgia,serif">Yes, what you describe is impossible.</font></font><div><font size="2"><font face="georgia,serif"><br></font></font></div><div><font size="2"><font face="georgia,serif">Since all of these requests are handled on the client/browser side, you can't effect them. The only way would be to either A) configure the user to proxy through your varnish for specific domains (ugly), or B) filter the user's DNS and replace <a href="http://flickr.com">flickr.com</a> etc with the IP of your varnish cache (even uglier). Neither is possible with general internet traffic.</font></font><div>
<font size="2"><font face="georgia,serif"><br></font></font></div><div><font size="2"><font face="georgia,serif">Not a Varnish thing, but in theory you could modify your backends to rewrite external URLs that they emit as <a href="http://your_varnish.com/flickr.com/real_file">http://your_varnish.com/flickr.com/real_file</a> (instead of <a href="http://flickr.com/real_file">http://flickr.com/real_file</a>) and then have Varnish perform cache magick on that rewritten URL. But start talking SSL and it all goes sideways. And this assumes you wanted only to proxy external URLs that your site is emitting.</font></font></div>
<div><font size="2"><font face="georgia,serif"><br></font></font></div><div><font size="2"><font face="georgia,serif">If there's a glimmer of possibility, it's a really ugly glimmer. ;-)<br clear="all"></font></font><font face="georgia, serif">-- </font><div>
<font face="georgia, serif">kb</font></div><br>
<br><br><div class="gmail_quote">On Tue, Mar 29, 2011 at 23:35, Ronny Östman <span dir="ltr"><<a href="mailto:ronny.ostman@apberget.se">ronny.ostman@apberget.se</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">Hello!</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">This might be a stupid question since I've searched alot and haven't really found the answer..</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">Anyway, I have a varnish set up caching requests to my backend the way I want it to and it works great</font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">for all content that my backend provides.</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">The problem I am having is caching content from remote sources.. I'm not sure if this is really possible since</font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">the request may not go through varnish.. i guess?</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">To further illustrate my question, here's an example of how it might look:</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">GET <a href="http://mydomain.com" target="_blank">mydomain.com</a> - Domain: <a href="http://mydomain.com" target="_blank">mydomain.com</a></font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">GET main.css - Domain: <a href="http://mydomain.com" target="_blank">mydomain.com</a></font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">GET hello.jpg - Domain: <a href="http://static.mydomain.com" target="_blank">static.mydomain.com</a></font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">GET anypicture.png - Domain: <a href="http://flickr.com" target="_blank">flickr.com</a></font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">GET foo.js - Domain: <a href="http://foo.com" target="_blank">foo.com</a></font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">In this example, is it possible to have my varnish cache those "remote" requests as well? I can set up backends</font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">for those remote domains and force varnish to use them instead of my own backend but I can't seem to find a</font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">way to have varnish do this "dynamically". The requests doesnt seem to go through my varnish according to</font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">varnishlog and this makes it hard to set backend depending on host.</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">Am I trying to accomplish something impossible here?</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">Thanks!</font></div>
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<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">Regards,</font></div>
<div align="left" style="text-align:left"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000">Ronny</font></div>
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