Uploadify upload http request 302 redirection exception in single sign-on

   For the single sign-on system, an HTTP ERROR 302 error occurs when uploading pictures and files, which is that the server needs login authentication, and the client uploadify does not send the sessionId in the cookie to the server. If there is interception or filtering, the request will be will be reset, so there will be a 302 error.
For this kind of problem handling;
  js code:
  

function getSessionId(){
	var c_name = 'JSESSIONID';
	if(document.cookie.length>0){
		c_start=document.cookie.indexOf(c_name + "=")
		if(c_start!=-1){
			c_start=c_start + c_name.length+1
			c_end=document.cookie.indexOf(";",c_start)
			if(c_end==-1) c_end=document.cookie.length
			return unescape(document.cookie.substring(c_start,c_end));
		}
	}
}
    

The uploadify method in the jquery.uploadify.js file:
Modify the red marked part of the
uploader 'uploader': '/incms/upload2/init.json ;jsessionid='+getSessionId()
The uploader instance code is as follows:

$('#uploadXls').uploadify({
		'swf' : SWF,
		'buttonText' : 'Browse',
		'width' : 50,
		'height' : 20,
		'fileSizeLimit' : '60MB',
		'multi' : true,
		'car': false,
		'successTimeout': 900,//The maximum timeout time returned by the server/second
		'method' : 'POST',
		'queueSizeLimit' : 100,
		'fileTypeDesc' : 'Upload Files',
		'fileTypeExts' : '*.xls; *.xlsx',
		'formData' : {'fileAmount':''},//'netType':'',
		'uploadLimit' :15,
		'uploader' : '/incms/upload2/init.json;jsessionid='+getSessionId(),
		'onDialogClose': function(queueData){
			fileAmount = queueData.filesQueued;
		},
		'onDialogOpen':function (){
			$('#uploadXls').uploadify('cancel','*');
		},
		'onUploadStart' : function(file) {
			$.messager.progress({title:'Please waiting',msg:'Importing.....',text:''});
		},
		'onSelect': function (file) {
			if(!$("#uploadIsMac").val()){
				$('#uploadXls').uploadify('cancel','*');
				$('#upload_detail_dialog').dialog('close');
				$.messager.alert(titleInfo,"Please select a device");
				return;
			}
		},
		'onCancel': function (file) {
			fileAmount=fileAmount-1;
		},
		'onUploadSuccess' : function(file, data, response) {
			//alert("PP:"+response);
			if(response==false){
				$.messager.progress('close');
				$.messager.alert(titleInfo, 'The data is too large, please check if all the imports are successful!');
				$('#uploadXls').uploadify('cancel','*');
				$('#upload_detail_table').datagrid('load');
				$('#upload_detail_dialog').dialog('close');
			}else{
				var json = $ .parseJSON (data);
				var jsonData=json.data.msg;//Return information
				if(jsonData !=null && jsonData !=''){
					if (json.data.code == 3) {
						//The selected manufacturer has no data
						$.messager.progress('close');
						$('#uploadXls').uploadify('cancel','*');
						$('#upload_detail_table').datagrid('load');
						$('#upload_detail_dialog').dialog('close');
						$.messager.alert(titleInfo, json.data.msg);
					}else if(json.data.code==2){
						//Partial import succeeded
						$.messager.progress('close');
						$.messager.alert(titleInfo,json.data.offerMsg);
						
						$('#uploadXls').uploadify('cancel','*');
						$('#upload_detail_table').datagrid('load');
						$('#upload_detail_dialog').dialog('close');
					}
				}else{
					 // do not display 100% of the progress   
					$.messager.progress({title:'Please waiting',msg:'Importing.....',text:''});
				}
			}
		},
		'onAllComplete' : function(event,data) {
		},
		'onUploadError' : function(file, errorCode, errorMsg, errorString) {
        }
	});