const {transformRequest, transformResponse}= axios.defaults;

await axios.post('https://httpbin.org/post', {}, {
  transformRequest: [transformRequest[0], (data, headers)=> {
    headers.setUserAgent('Mozilla/3.0 (X11; I; AIX 2)');
    console.log('My header', headers.get('my-header'));
  }],
  transformResponse: [transformResponse[0], (data, headers)=> {
    console.log(headers);
    console.log('Content Length (direct access):', headers['content-length']);
    console.log('Content Length:', headers.getContentLength());
    console.log('Has server header:', headers.has('sErvEr'));
    console.log('Is gunicorn server:', headers.has('server', 'gunicorn'))
    console.log('Gunicorn version:', headers.get('server', /gunicorn\/([\d.]+)/)[1])
  }],
  headers: {
    'my-header': 'value1'
  }
});