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marcofbb/cloudflare_remove_gets.vcl

Created April 3, 2020 01:41
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Varnish remove GET parameters Cloudflare under attack challange
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cloudflare_remove_gets.vcl
# in vcl_recv
if (req.url ~ "(\?|&)(__cf_chl_jschl_tk__)=") {
set req.url = regsuball(req.url, "&(__cf_chl_jschl_tk__)=([A-z0-9_\-\.%25]+)", "");
set req.url = regsuball(req.url, "\?(__cf_chl_jschl_tk__)=([A-z0-9_\-\.%25]+)", "?");
set req.url = regsub(req.url, "\?&", "?");
set req.url = regsub(req.url, "\?$", "");
}
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