Resolves #2705: add explicit set of path component to generated uri #3339
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Resolves #2705 and #3315. Zend URI classes only add a / automatically if there is either a query or fragment present. There is no query or fragment on the URI for varnish purge requests, so we must explicitly set the path component for it to be correctly included in the request URI. See #2705 (comment) for further details.