Well, it turns out that getting rid of Vary within mod_negotiation isn't as straightforward as I'd hoped, so I've gone and change http_protocol.c in version 1.3.37 and http_filters.c in 2.2.4 so that setting "force-no-vary" does not fall back to HTTP/1.0. The only way I plan to use "force-no-vary" is by putting the following line in httpd.conf: BrowserMatch MSIE force-no-vary With that in mind, can someone who know more about these things than I do comment on the safety of this approach? As long as I limit "force-no-vary" to MSIE, is there any risk of *not* degrading to HTTP/1.0? And are the changes I made in these files sane? ***************** Diff for 1.3.37 ***************** --- http_protocol.c,orig 2007-05-04 03:24:18.000000000 +0000 +++ http_protocol.c 2007-05-04 03:49:25.000000000 +0000 @@ -1942,8 +1942,6 @@ */ if (ap_table_get(r->subprocess_env, "force-no-vary") != NULL) { ap_table_unset(r->headers_out, "Vary"); - r->proto_num = HTTP_VERSION(1,0); - ap_table_set(r->subprocess_env, "force-response-1.0", "1"); } else { fixup_vary(r); ***************** Diff for 2.2.4 ***************** --- http_filters.c,orig 2007-05-04 04:00:30.000000000 +0000 +++ http_filters.c 2007-05-04 04:02:05.000000000 +0000 @@ -961,8 +961,6 @@ */ if (apr_table_get(r->subprocess_env, "force-no-vary") != NULL) { apr_table_unset(r->headers_out, "Vary"); - r->proto_num = HTTP_VERSION(1,0); - apr_table_set(r->subprocess_env, "force-response-1.0", "1"); } else { fixup_vary(r); --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx