Supply httpMsgIsPersistent() with request version it needs to
determine client connection persistency rather than some 
irrelevant information.

=== modified file 'src/client_side.cc'
--- src/client_side.cc	2010-08-07 14:22:54 +0000
+++ src/client_side.cc	2010-08-14 01:43:44 +0000
@@ -742,10 +742,7 @@
     debugs(33, 3, "clientSetKeepaliveFlag: method = " <<
            RequestMethodStr(request->method));
 
-    /* We are HTTP/1.1 facing clients now*/
-    HttpVersion http_ver(1,1);
-
-    if (httpMsgIsPersistent(http_ver, req_hdr))
+    if (httpMsgIsPersistent(request->http_ver, req_hdr))
         request->flags.proxy_keepalive = 1;
 }