How to hide the server version?

Thomas iamkenzo at
Tue Jul 8 00:19:49 MSD 2008

Using the following directive:
  ## Deny certain Referers (case insensitive)
  if $http_referer ~* (poker|sex|girl|grapx|allegro\.pl) {
    return 444;

I get the following error message:
[emerg] 2854#0: invalid condition "$http_referer"

The spelling is correct, what did I make wrong?

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