how to use admin api to trim_usage.

[鹏 <wkp4666@xxxxxxx>]

 hi:
    I follow the docment http://ceph.com/docs/master/radosgw/adminops/#trim-usage   send

DELETE /{admin}/usage?format=json HTTP/1.1
but the rwsquest is 400 {"Code":"InvalidArgument"}

the log is 

compare=0
DELETE   /admin/usage:trim_usage:reading permissions
DELETE  /admin/usage:trim_usage:reading the cors attr
Going to read Cors from attrs
DELETE /admin/usage:trim_usage:executing
DELTET /admin/usage:trim_usage:http status=400
============= req done req=0x16e35e0 http_status=400 ===========

the user caps is
    caps :[
         {"type":"usage","perm":"*"}
         {"type":"users","perm":"*"}
]

why it ret urn 400, can you help me to poin that what mistake i make !!!!!
think you !!!!!!!!!1

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