Unable to get authentication token

I'm trying to get authentication token by using the below code but am didnt get any. However, I got token in Postman.

fetchPeople() {
//return this.http.post('http://169.38.82.132:94/token',data,{ headers: this.headers });
let url = "http://169.38.82.132:94/token";
var headers = new HttpHeaders();
headers.append('Content-Type', 'application/x-www-form-urlencoded');
headers.append('Accept', 'application/json');
let urlSearchParams = new URLSearchParams();
urlSearchParams.set('grant_type', 'password');
urlSearchParams.set('username', 'user');
urlSearchParams.set('password', 'user');
//let body = urlSearchParams.toString();
const data = 'grant_type=password';
return this.http.post( url, data,
{headers: new HttpHeaders({
'Accept': 'application/json',
'Content-Type': 'application/x-www-form-urlencoded'
})}
)
};
}
console.log(data);


Did I missed any logical settings. Please guide me to get authentication token. In console am getting:

grant_type=password&username=user&password=user
Angular is running in the development mode. Call enableProdMode() to enable the production mode.
Live Reloading enabled.
POST http://169.38.82.132:94/token 400 (Bad Request)
​

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