Use a weak etag comparison:

http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16451

(similar but simpler than the fix in CVS HEAD)

--- httpd-2.0.45/modules/dav/main/util.c.davetag	2003-05-19 14:43:45.000000000 +0100
+++ httpd-2.0.45/modules/dav/main/util.c	2003-05-19 14:41:04.000000000 +0100
@@ -1072,7 +1072,17 @@
             switch(state_list->type) {
             case dav_if_etag:
             {
-                int mismatch = strcmp(state_list->etag, etag);
+                int mismatch;
+                const char *given_etag = state_list->etag;
+                const char *current_etag = etag;
+
+                if (given_etag[0] == 'W' && given_etag[1] == '/')
+                   given_etag += 2;
+               
+                if (current_etag[0] == 'W' && current_etag[1] == '/')
+                    current_etag += 2;
+ 
+                mismatch = strcmp(given_etag, current_etag);
 
                 if (state_list->condition == DAV_IF_COND_NORMAL && mismatch) {
                     /*