const config = {
        responseType:"json",
        onDownloadProgress: (progress) => {
            let length = progress.lengthComputable ? progress.total : progress.target.getResponseHeader('Content-Length') || progress.target.getResponseHeader('x-decompressed-content-length');
            if (length !== null) {
                this.progressBar(Math.round((progress.loaded * 100) / length));
            }
        }
    };
    axios.get('/myurl', config)
        .then(res => {
            // some code
        });