This is necessary during development or testing stages. The advantage of this approach is that only your browser session is affected. In other words, your visitors will keep seeing cached versions (if available).
If you wanted to make changes to the page: http://www.domain.com/varnish/ , you can do so by adding the string debug to the NoCache Directive feature and then you'd access the page using http://www.domain.com/varnish/?nocache or http://www.domain.com/varnish/?action=go&nocache
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