How to cancel a HTTPRequest in Angular 2?

How to cancel a HTTPRequest in Angular 2?

I know how to reject the request promise only.

return new Promise((resolve, reject) => {
this.currentLoading.set(url, {resolve, reject});

this.http.get(url, {headers: reqHeaders})
.subscribe(
(res) => {
res = res.json();

this.currentLoading.delete(url);
this.cache.set(url, res);

resolve(res);
}
);
});

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