Yii2 does not parse json requests. How to win?

Question

JavaScript

Colleagues prompt on a question. Send json in ajax request:

var register_headers = new Headers();
register_headers.append('Content-type', 'application/json');
var headers = {headers: register_headers};
return new Promise((resolve) => {
  this._http.post('http://localhost/auth/login', JSON.stringify({username: 'username',password: 'password'}), headers)
.subscribe((data) => {if (data.json().success) {...}})
        })

with the header "'Content-type', 'application/json'"
Yii2 does not see this data in
Yii::$app->getRequest()->getBodyParams()
Judging by the docs, you need to write in the config for this:

'components' => [
        'request' => [
            'parsers' => [
                'application/json' => 'yii\web\JsonParser'

I did but didn't help. at the same time, this code parses everything normally

$body = json_decode(Yii::$app->getRequest()->getRawBody(), true);

I can't understand shit

Answer 1

in general, the issue was resolved. It turned out that when cross-domain requests through the browser are sent with json data and the "'Content-type application/json" header, they are converted from post to options.
in Yii I set that the "text/plain" request is perceived as REST, removed the header in js and everything worked.

Answer 2

You need to send an object as data in the ajax request.