Transparent Proxy:

With this you can specify if YaCy can be used as transparent proxy.
Hint: On linux you can configure your firewall to transparently redirect all http traffic through yacy using this iptables rule:
iptables -t nat -A PREROUTING -p tcp -s 192.168.0.0/16 --dport 80 -j DNAT --to 192.168.0.1:#[port]#

Connection Keep-Alive:

With this you can specify if YaCy should support the HTTP connection keep-alive feature.

Send Via Header:

Specifies if the proxy should send the Via http header according to RFC 2616 Sect 14.45.

Changes will take effect immediately.