set actionMethods to 'POST' is no effect for Ext.data.proxy.Ajax

var store = Ext.create('Ext.data.Store', {

.........................................

proxy: {

type: 'ajax',

url: 'data.php',

actionMethods: 'POST',

..............................................



In the store create, I set the actionMethods to 'POST',

but it make a 'GET' request. not the 'POST' request.