title: HTTP request with axios in NodeJS not able to change header format
body: <p>I have an API that accepts headers as list of strings formatted as:</p>
  
  <pre><code>headers: [
      "Content-Type: application/json"
  ]
  </code></pre>
  
  <p>Unfortunately I'm not finding a way to send the headers this way in axios as they get formatted into a map structure like so:</p>
  
  <pre><code>headers: {
       "Content-Type": "application/json"
  }
  </code></pre>
  
  <p>The map structure is obviously the better structure, but I have to support the limitations of existing systems. Is there any way to change this formatting in axios?</p>