[PATCH] For Vary processing, treat an empty header (only whitespace), like a non-existent header[PATCH] For Vary processing, treat an empty header (only whitespace), like a non-existent header

[Nils Goroll]

Our interpretation of http://tools.ietf.org/html/rfc7234#section-4.1 is that
removing all whitespace from a header field only containing whitespace
equals to removing the header.
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