Varnish could build an Etag based on all collected Etags from the backend

[Jordi Llach]

When using Varnish in conjunction with ESis no one but Varnish could build
a global Etag that really summarizes the response send to the client.

I am wondering if Varnish could build a global Etag based on all Etags
received from the backend.
I understand that creating this Etag from multiple chunks(ESIs) is cpu
intensive and thus I am wondering if Varnish could build this Etag based on
all ESI Etags received, instead of doing it from the body/html in itself

Jordi
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