Content-Disposition: download file automatically

The API call to the server is returning a zip file with Content-Disposition in format attachment, <filename> I am using FileSaver's saveAs to save the file.

    this.ajax.raw(requestUrl, {
        dataType: 'binary',
        xhr: () => {
          const myXhr = $.ajaxSettings.xhr()
          myXhr.responseType = 'blob'
          return myXhr
        }
      }).then((response) => {
        this.downloadSuccess(response, minTimeString, maxTimeString, downloadCompletedMessage)
      }).catch((e) => {
        this.downloadError(e)
      })

downloadSuccess (response, minTime, maxTime, downloadCompletedMessage) {
    const filename = (response.jqXHR.getResponseHeader('Content-Disposition').split('"')[1])
    saveAs(response.payload, filename, 'application/zip')

This works fine for small files but fails if the file is more than 2Gb (The file is downloaded successfully but the saved file is of 1Kb only).

During my research, I saw that browser can download the file without FileSaver if the response has Content-Disposition which is true in my case. But I am not able to figure out how.

Do I need to use request differently?