var content_type_store = new Ext.data.Store({
    proxy: new Ext.data.HttpProxy({
    url: BASE_URL+'questions/content_pie',
    method:'POST',
    params :{hi:''}

    }),
    reader: new Ext.data.JsonReader({
    root: 'results'
    }, [
    'qtype',
    'qval'
    ])
    });

var content_type_store = new Ext.data.Store({
  proxy: {
    type: 'ajax',
    url: BASE_URL+'questions/content_pie',
    extraParams :{hi:''},
    // Here Magic comes
    getMethod: function(request){ return 'POST'; }

  },
  reader: {
    type: 'json',
    root: 'results'
  }
});

// ...
  proxy: {
    type: 'ajax',
    url: BASE_URL+'questions/content_pie',
    extraParams :{hi:''},
    // Here Magic comes
    actionMethods: {
      create : 'POST',
      read   : 'POST',
      update : 'POST',
      destroy: 'POST'
    }
  },
  // ...

Ext.define('content_type_model',{
extend : 'Ext.data.Model',
proxy  :  {
type  :  'ajax',
url   :  BASE_URL+'questions/content_pie'
reader : {
type  :  'json',
root  :  'results'
}
},
fields : [{
name:'qtype', mapping:'qval'}]
});

var content_type_store = Ext.create('Ext.data.Store',{
    model : 'content_type_model'
    });

grid.store.load({
params : {
hi :''
}
});