404 site:http://perl.apache.org/docs/2.0/ 
For example, if a handler wants to return a 404 response, but
nevertheless to set a cookie, it has to be:

  $r->err_headers_out->add('Set-Cookie' => $cookie);
  return Apache2::Const::NOT_FOUND;

If the handler does:

  $r->headers_out->add('Set-Cookie' => $cookie);
  return Apache2::Const::NOT_FOUND;

the C<Set-Cookie> header won't be sent.

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In reply to Re: mod_perl give 404 not_found with content by Anonymous Monk
in thread mod_perl give 404 not_found with content by Jaap

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