add no-proxy envvar for mod_proxy

replacement for ProxyPass /path ! when ProxyPass is in
location context.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1781328 13f79535-47bb-0310-9956-ffa450edef68

modules/proxy/mod_proxy.c

@@ -781,6 +781,10 @@ static int proxy_trans(request_rec *r)
         || !r->uri || r->uri[0] != '/') {
         return DECLINED;
     }
+   
+    if (apr_table_get(r->subprocess_env, "no-proxy")) { 
+        return DECLINED;
+    }
 
     /* XXX: since r->uri has been manipulated already we're not really
      * compliant with RFC1945 at this point.  But this probably isn't