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Bugfix release. Fixing various minor issues including:
Issue #1299776: Sending purge request should retain url path and query string.
Issue #1502915 by hernani,jaydub: Purge multiple domains
Issue #1760408 by heddn: Invalid error logic and logging
Issue #1551232 by pbull,asgorobets: proxy_url_base is not set when using ah purge method