varnish-vcl

My goal is to "whitelist" certain querystring attributes and their values so varnish will not vary cache between the urls. Example: Url 1: http://foo.com/someproduct.html?utm_code=google&type=hello Url 2: http://foo.com/someproduct.html?utm_code=yahoo&type=hello Url 3: http://foo.com/someproduct.html?utm_code=yahoo&type=goodbye In the above example I want to whitelist "utm_code" but not "type" So after the first url is hit I want varnish to serve that cached content to the second url. However, in the case of the third url, the attribute "type" value is different so that should be a varnish

How can I print a log in VCL? Can I print log info on screen? Can I do like this? sub vcl_recv { .... log.info(req.http.host); // can i write a log here? .... } ghloogh You can see URL with requested URLs varnishlog utility (it able to write log files) varnishlog -i RxURL Or output some info to syslog with vmod std and syslog function for Varnish 3.x https://www.varnish-cache.org/docs/trunk/reference/vmod_std.html#syslog Varnish 5.1 https://varnish-cache.org/docs/5.1/reference/vmod_std.generated.html#func-syslog Example: import std; sub vcl_recv { ... std.syslog(180, "RECV: " + req.http.host +