Dude, as a good cdn will set cache headers to make browsers store the items forever, without even re-validating content.
Definitely not very useable for tracking purposes, they will only know about first visit of a user. Even more if sites a and b use the same js library and version, they will only know about the first that a user visit.
Anyway is a bad technical decision not to use a different domain to ensure clients don't need to send extra cookies in the headers.
Definitely not very useable for tracking purposes, they will only know about first visit of a user. Even more if sites a and b use the same js library and version, they will only know about the first that a user visit.
Anyway is a bad technical decision not to use a different domain to ensure clients don't need to send extra cookies in the headers.