Javascript Fetch post return status 400?

[wildfiremedia]

One particular strange issue with fetch(), I have defined /admin/recall/:id on Echo route endpoint and tried to test with

Update: Added CSRF infor formdata with key and value which is similar to other working POST form.

let d = new FormData();
d.append("abc", "...based on the CSRF value provides from Go backend...");
for (var value of d.values()) {
        console.log(value);
}

 fetch("/admin/recall/" + id, {method: "delete"})
    .then(r => {
        r.text();
    }).catch(e => {
        console.log(e);
    });

Other POST and GET that does not communicate with Javascript are working fine.
What is the actual missing detail I need to get it to work?

[aldas]

please add example of your code

[wildfiremedia]

Resolved, missing CSRF.