Why is a fetch request not working?

Question

css

Good afternoon.
I made a request in postman and it is successful.
There, in the headers, you need to pass 3 parameters, login, password and api key.

Both work, and get and post.

But when I try to fetch data in vue, I get 400 bad reqeust.

created () {
      fetch("https://api.agimonline.com/v1/properties/list", {
          method: "POST",
          mode: "no-cors",
          headers: {
            "X-Api-User": "###",
            "X-Api-Pwd": "###",
            "X-Api-Key": "###"
          }
        }
      )
        .then(res => res.json())
        .then(data => console.log(data))
    }

What didn't I learn?

Thanks in advance.

Answer 1

onclick="return OnClick1();"
possible without return

Answer 2

in fetch

mode: 'cors',
cache: 'no-cache',
credentials: 'same-origin'

and from the server side Headers:

Access-Control-Allow-Origin: * // или referer server name
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS

Answer 3

Well, POST is sending data, not receiving data.
Perhaps this route has a POST request, but it expects data to be transmitted that you do not transmit.