title: sending data using POST method in sencha extjs rest webservice
body: <p>I wanna save a model by sending data using post method to my web server,
  I wrote these codes and noticed that sencha is sending data using the GET method.
  how can I send the data using POST method?
  my model code:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>Ext.define('MyApp.model.emp.Roles', {
      extend: 'MyApp.model.Base',
  
      fields: [
          {
              type: 'int',
              name: 'id'
          },
          
  {
              type: 'string',
              name: 'title'
          },
      ],
      proxy: {
          type: 'ajax',
          url : 'http://myweb.test/json/fa/myweb/managerole.jsp',
          idParam: 'id',
          extraParams: {
              'action':'btnSave_Click'
          },
  
          method:'POST',
          actionMethods: {
              create : 'POST',
              read   : 'POST',
              update : 'POST',
              destroy: 'POST'
          },
      }
  });</code></pre>
  </div>
  </div>
  </p>
  
  <p>save calling code:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>{
              xtype: 'button',
              text:  'ذخیره',
              handler:function()
              {
                  var user = Ext.create('MyApp.model.emp.Roles', {title: 'A Role From Sencha'});
                  user.set('title','hi');
                  user.set('id',-1);
                  user.save({
                      params: user.getData(),
                      callback: function (records, operation) {
                          Ext.Msg.alert('User Save', operation.getResponse().responseText);
                      },
                      methodName:'POST',
                      method:'POST',
                  });
  
              }
          }</code></pre>
  </div>
  </div>
  </p>