Can I add an header in Axios.Create() and another in .post()? code example

Example 1: how to send header in axios

const username = ''
const password = ''

const token = Buffer.from(`${username}:${password}`, 'utf8').toString('base64')

const url = 'https://...'

axios.post(url, {
  headers: {
    'Authorization': `Basic ${token}`
  }
})

Example 2: axios set request header

axios.post('http://localhost/M-Experience/resources/GETrends.php',
      {
        firstName: this.name
      },
      {
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
      });