[mod_proxy] send HTTP/1.0 to backend if no Host
[mod_proxy] send HTTP/1.0 to backend if no Host

send HTTP/1.0 request to backend if no Host header sent with request

(If Host header is present with an HTTP/1.0 request from client, then
 lighttpd can still make an HTTP/1.1 request to backends)

gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4