Hello everyone:

Sometimes when i test a survey using a upload file answer, appears (not always) a

400 error "Bad Request" "The request could not be understood by the server due to malformed syntax. Please do not repeat the request without modifications."

I try to find, the cause of the problem, but when i see additional information in a developer console appears this error:

Microsoft Edge throws error: modaldialog.js (31,21) SCRIPT438: Object doesn't support property or method 'saveAndExit'

I put the code of a function openUpladModalDialog() modaldialog.js from here:

function openUploadModalDialog(){
$('.upload').click(function(e) {

    e.preventDefault();

    var $this = $(this);
    var show_title   = getQueryVariable('show_title', this.href);
    var show_comment = getQueryVariable('show_comment', this.href);
    var pos          = getQueryVariable('pos', this.href);
    var fieldname    = getQueryVariable('fieldname', this.href);
    var buttonsOpts = {};
    buttonsOpts[uploadLang.returnTxt] = function() {
        $(this).dialog("close");
    };

    $('#file-upload-modal-' + fieldname).appendTo('body').modal();
    $(document).on('shown.bs.modal','#file-upload-modal-' + fieldname, function()
    {
        updateMaxHeightModalbody($(this));
    });
    $('#file-upload-modal-' + fieldname).on('hide.bs.modal', function() {
        var pass;
        var uploaderId = 'uploader' + fieldname;
        if(document.getElementById(uploaderId).contentDocument) {
            if(document.getElementById(uploaderId).contentDocument.defaultView)
                {       /*Firefox*/
                pass=document.getElementById(uploaderId).contentDocument.defaultView.saveAndExit(fieldname,show_title,show_comment,pos);
            }else{       /*IE8*/
                pass=document.getElementById(uploaderId).contentWindow.saveAndExit(fieldname,show_title,show_comment,pos);
            }
        }else{    /*IE6*/
            pass=document.getElementById(uploaderId).contentWindow.saveAndExit(fieldname,show_title,show_comment,pos);
        }
        return pass;
    });
});

}

I use Limesurvey version 3.17.3+190429

Any advice will be well accepted.

Thanks for advance,