Available in all subroutines.

Returns the separator needed by the querystring.filter and querystring.filter_except functions.


set req.url = querystring.filter(req.url,
"utm_source" + querystring.filtersep() +
"utm_medium" + querystring.filtersep() +

Try it out

querystring.filtersep is used in the following code examples. Examples apply VCL to real-world use cases and can be deployed as they are, or adapted for your own service. See the full list of code examples for more inspiration.

Click RUN on a sample below to provision a Fastly service, execute the code on Fastly, and see how the function behaves.

Normalize requests

Improve cache performance by normalizing requests. Filter and reorder query params, convert to lowercase, filter headers, and more.