Angular 8 call web api to login token based with owin

I’m at the beginning with angular and I have a problem with the call to authenticate my web api. My web api use Owin and I’ve already used it with an old asp site. I call whith ajax without problems:

				url: _TokenApi, 
				type: 'POST',
				dataType: 'json',
				contentType: 'application/x-www-form-urlencoded; charset=UTF-8',
				headers: {
					"Authorization": _CLIENTAUTH
				/* data: JSON.stringify(body), /* wrong */
				data: body, /* right */
				complete: function(result) {


				success: function(result) {

				error: function(result) {
					 xms_alert('warning', 'Attenzione', 'Token non recuperato correttamente');

I want to make the same call with angular,I found an example done this way

UserAuthenticationOriginal(UserName: string,Password: string):Observable{
let credentials='username=' +UserName + '&password=' +Password +'&grant_type=password';
var reqHeader = new HttpHeaders({'Content-Type': 'application/x-www-urlencoded','No-Auth':'True' });

this function arrives at the web api, but obviously it doesn’t authenticate because I called with: ‘No-Auth’: ‘True’

I tried to replace with

headers.set('Content-Type', 'application/x-www-form-urlencoded');
headers.set("Authorization", 'BASIC XXXXXXX'); let credentials='username=' +UserName + '&password=' +Password +'&grant_type=password'; 
let a='token',encodeURI(credentials),{headers:headers});

But I have a Error: ERROR TypeError: “this.api.UserAuthentication(…) is undefined”

and does not make any calls to the web api

The problem not is in angular call but in web api.
I add in Startup.cs this:

and remove in WebApiConfig.cs this:

var corsAttr = new EnableCorsAttribute("", "", “*”);

Did that solve it?

And thank you posting the answer, someone in 6 months will find this on Google and thank you too :slight_smile: