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I'm currently running Magento 1.7 with Varnish Turpentine.

I have noticed a strange behavior on cached content - Varnish returns same content for mobile and tablet(iPad), although in Magento back-end I have set design exceptions for matched expressions (iPad should use default, mobiles use mobi) and it works like a charm until varnish default.vcl is applied.

After checking around I found out that varnish use device detection and normalizes user-agent as per following:

if (req.http.User-Agent ~ "iP(?:hone|ad|od)|BlackBerry|Palm|Googlebot-Mobile|Mobile|mobile|mobi|Windows Mobile|Safari Mobile|Android|Opera (?:Mini|Mobi)") {
set req.http.X-Normalized-User-Agent = "mobile";

Well, fair enough... clearly mobiles and tablets will return same cache hit as both are normalized as mobile ... lets separate iPad I though

if (req.http.User-Agent ~ "iP(?:hone|od)|BlackBerry|Palm|Googlebot-Mobile|Mobile|mobile|mobi|Windows Mobile|Safari Mobile|Android|Opera (?:Mini|Mobi)") {
set req.http.X-Normalized-User-Agent = "mobile";
else if (req.http.User-Agent ~ "iPad") {
set req.http.X-Normalized-User-Agent = "ipad";

A big surprise after this change was that varnish still returns same cached content.

I have tried to use different varnish device-detects but all unfortunately failed.

Have anybody has a smallest clue what could be the issue?

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  • After you made the change to separate iPad, did you apply those VCL changes to the running instance of Varnish?
    – Aric Watson
    Mar 31, 2016 at 15:48
  • Hi, thank you for your time helping to sort this out. Yes, I did apply changes to running instance, also I tried to restart varnish on the server and applied changes on running instance afterwards but both returned same issue.
    – Aivis Zvezdovs
    Mar 31, 2016 at 18:33
  • Ok, perhaps try turning off the Normalize User-Agent option in Turpentine as a test and see if that works?
    – Aric Watson
    Mar 31, 2016 at 18:55
  • Hi, once Normalize User-Agent option is turned off, cache serves one content for all devices (even if I apply new config). Also I noticed that if Normalize User-Agent option is on and I delete all entries regarding device detection and apply it, cache still serves different content for mobile agent and pc agent.
    – Aivis Zvezdovs
    Apr 1, 2016 at 9:45

1 Answer 1

Reset to default
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Without hashing, it won't change the content, please check below, it will help

sub vcl_recv {
    if (req.http.User-Agent ~ "iP(?:hone|od)|BlackBerry|Palm|Googlebot-Mobile|Mobile|mobile|mobi|Windows Mobile|Safari Mobile|Android|Opera (?:Mini|Mobi)") {
        set req.http.X-Normalized-User-Agent = "mobile";
    } 
    else if (req.http.User-Agent ~ "iPad") {
       set req.http.X-Normalized-User-Agent = "ipad";
    else {
       set req.http.X-Device = "other";
    }
}

sub vcl_hash {
    if (req.X-Normalized-User-Agent) {
       hash_data(req.X-Normalized-User-Agent);
    }
}

sub vcl_deliver {    
    set resp.http.X-Varnish-Device = req.X-Normalized-User-Agent;
}

Will definitely recommend to use devicedetect.vcl instead of relying on user agent.

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