How To Send Post Request To Current Url?

How Can I Send Post Request In Js ?

I tried :

fetch(window.location.href,{
    method: 'POST',
    body: JSON.stringify(''),
    headers :{
      'Content-Type': 'application/json',
      'X-CSRFToken': '{{ csrf_token }}'
    },
})

but its shows 404

i use django as backend . should i define a different url for post instead using one url for get and post ?