Split losthdr between client and backend

[Poul-Henning Kamp]

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In message <20130110120805.GA3581 at immer.varnish-software.com>, Lasse Karstensen
 writes:

>I'd like to propose an additional varnishstat counter that counts requests
>rejected (413) due to http_req_hdr_len overflow.

I have mucked about and done something along these lines, let me know
if it works for you.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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Never attribute to malice what can adequately be explained by incompetence.