Reg: backend 'name' in VCL before going to origin

[Hardik]

Hi Team,

Requirement : *to set few headers based on backend origin ( having multiple
origins/backends in single director)*.

I want to do similar to this.
https://stackoverflow.com/questions/43357690/varnish-vcl-how-can-i-switch-on-req-backend-hint

sub vcl_backend_fetch {
    if (bereq.backend.name == "one") {
       std.log("one");
    } else if (bereq.backend.name == "two") {
       std.log("two");
    } else {
       std.log("neither one");
    }
}


I am trying to do same (inside b_fetch) but getting error that symbol not
found. I am using varnish 6.1.
Is this different function call/name for varnish 6.1 ?

Thank you
Hardik
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