increase max headers to 64 to cope with modern browsers + proxy combinations

increase max headers to 64 to cope with modern browsers + proxy combinations

This is mostly a "do not allow infinity headers" limit in the sense
of "it's good to have limits". With modern browsers and users behind
proxies we may actually get over 30 headers, so increase it for now
to 64 - hopefully enough for another decade ;)

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Reported-by: Victor Hooi <victorhooi@yahoo.com>