[Cache] Handling requests without Host

[vladtcvs]

need to send 2 requests, one with "/", next with "http://localhost/"

# telnet 127.0.0.1 80
GET / HTTP/1.1<enter>
<enter>
.....
GET http://localhost/ HTTP/1.1<enter>
<enter>

kernel faults
log with DEBUG=3 attached
consolelog.txt

[vladtcvs]

Update: it's a problem with cache. It disappears with cache off;

[krizhanovsky]

This is the old version of cache, before e983990, which has many issues. Moreover, the problem raises at ss_send() where we also have issues on sharded cache (see #337 and #343).

So the issues is partially outdated and partially duplicate.