I believe that your last answer is correct ... but you should share it instead of glazing it ... I believe that you use the parameters in this way, if it is not, I believe that you are doing something what are you trying to do.
Ext.Ajax.Request({
url: 'path/to/file.htm',
params: {
jsessionid: Ext.util.Cookies.get('jsessionid')
},
success: function(result, request) {
}
});
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share