Hi Mladen,
Now that I think more of that, you can use the Apache's 'LimitRequestLine' directive (default 8190), so this won't get to the mod_jk at first.
this will indeed fix some cases, but the AJP13 packet can still be filled up by adding junk headers to the request, Apache does not take headers into account to compute the size of the RequestLine (only the URI is).
The DOS condition is then still there.
Mathias.
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