Cache Invalidation

[Guillaume Quintard]

FWIW: a lot of CMS can be configured to warn varnish that content has
changed (
http://devdocs.magento.com/guides/v2.0/config-guide/varnish/config-varnish-magento.html
)

In this case, the backend will issue HTTP requests to purge content, and of
course, your VCL must be ready to treat them.
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