[users@httpd] Question about mod_dav in Apache2(Centos)

[zMatthew]

I configured Apache2 to allow "PUT" method on a directory,
     /usr/local/apache/DAVLock is writeable by Apache    "LoadModule dav_module 
modules/mod_dav.so"  is uncommented    "LoadModule dav_module 
modules/mod_dav_fs.so" is uncommented
I just added  2 lines in default httpd.conf

DAVLockDB /usr/local/apache/DAVLock
 
<Directory />
    DAV On
    ....

However, PUT method still isn't seen via " OPTIONS / HTTP/1.0"
Could someone give me a hand? thanks