How to disable valid_referers?

[Horus Lee]

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...never mind, I can set $invalid_referer to 0 to do this.
Anyway, thanks, and sorry for the ask-n-answer. :-P

> Hi guys,
> 
> Say if I have many files under / (document root), all of them need
> hotlink protection, except one.
> [...omitted...]
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=/aSO
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