Strip analytics (Google, Facebook etc) query parameters in Fastly

recv.vcl

# Query string stripping for web analytics.
#
# Currently stripped query parameteres include:
#  - Google Analytics
#  - Google Adwords (Doubleclick)
#  - Facebook
set req.http.X-Original-Url = req.url;
set req.url = querystring.globfilter(req.url, "utm_*");
set req.url = querystring.filter(req.url,
    "fbclid" + querystring.filtersep() +
    "dclid" + querystring.filtersep() +
    "gclid" + querystring.filtersep() +
    "_ga" + querystring.filtersep() +
    "gclsrc");