I'm using varnish to cache our pages. When we get a 503 -- which happens a little too often -- I'd like to put some sort of page tracking on there. I'd like to place the GA code in there. I can't seem to find any instance of anyone else doing this. Has anyone done this? Is there some sort of T&C violation in doing this?
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When you get a 503 page does the user get redirected to a different page or does he see the same page? – Eduardo Jul 17 '12 at 00:36
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For Varnish you can use vcl_error to include your own responses (that have the Google Analytics code).
Edit: I have not tested any of these. They are just examples.
An example:
sub vcl_error {
set obj.http.Content-Type = "text/html; charset=utf-8";
if (obj.status == 503) {
synthetic {"
<html>
<head>
<title></title>
</head>
<body>
<h1>Error</h1>
<p>Something</p>
<!-- ANALYTICS CODE -->
</body>
</html>
"};
return(deliver);
}
}
Alternatively you can add your own pages from the file system by using vmod (which is included as standard with version 3.*+).
# Add this to the top of your config
import std;
# vcl_error
sub vcl_error {
set obj.http.Content-Type = "text/html; charset=utf-8";
if (obj.status == 503) {
set obj.http.error503 = std.fileread("/path/to/errors/503.html");
synthetic obj.http.error503;
return(deliver);
}
}

Gibbs
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You can just do "synthetic std.fileread("/path/to/errors/503.html");" instead. – mdrozdziel Apr 12 '13 at 07:37