Available in all subroutines.
set req.url = querystring.filter(req.url,"utm_source" + querystring.filtersep() +"utm_medium" + querystring.filtersep() +"utm_campaign");
Try it out
querystring.filtersep is used in the following solution recipes, which show real world use cases. Click RUN to provision a Fastly service, execute the code on Fastly, and see how the function behaves.
Improve cache performance by normalizing requests. Filter and reorder query params, convert to lowercase, filter headers, and more.
User contributed notes
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