Everything that is to be said about this header was already written long time ago in this thread.
http://www.gnutellaforums.com/showth...017#post147317

Since Shareaza always rejected that there are nodes in Gnutella search results, download mash or downloading files, without having the Gnutella network enabled, this header should never be send and should not cause any problems.
And AFAIK Shareaza, while still polluting, ignores this header already anyway...

This has nothing to do with GWebCache though...

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