title: What is axios.defaults.headers.post 'content-type' = 'application/json'
body: <p>I am new to react and and i am finding difficult to understand what  <code>axios.defaults.headers.post 'content-type' = 'application/json'</code> means.</p>
  
  <p>I had search a lot but not find suitable answers what does it means.</p>