Thanks for your reply,
I don’t think that the problem come from VCL..
As I have said, I think that W3TC have to take care of Domain Mapping configuration.
In many case, Varnish Proxy is like any “anonymous” Internet client.
If the solution is to change the VCL to “rewritte” domain.tld/fr/articleA to domain.fr/articleA – It makes no sens..
And what about SaaS Reverse Proxy like Cloudflare where I can’t change the Proxy configuration ?
Thank you for your time.
Thomas.