401 (Unauthorized) error when create a post

[aymangithub]

please. I have an 401 (Unauthorized) error when I create a post

error: https://localhost/hl-bir/wp-json/wp/v2/posts 401 (Unauthorized)

and this is the function:

createPost(body: any) { let headers = new Headers(); headers.append('Content-Type', 'application/json;charset=UTF-8'); headers.append('Access-Control-Allow-Origin', '*'); headers.append('Access-Control-Allow-Headers', 'Content-Type, Content-Range, Content-Disposition, Content-Description'); headers.append('Access-Control-Allow-Methods', 'DELETE, HEAD, GET, OPTIONS, POST, PUT'); headers.append('Authorization', 'Basic ' + btoa('username:password')); headers.append('Cache-Control', 'no-cache'); this.wpApiPosts.create(body, headers) .toPromise() .then(response => response.json()) .then(res => { console.log(res); }) .catch(err => { console.log(err); }); }

this.wpProvider.createPost(
  { titte: 'MyPost3', status: 'publish' }
);

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Note that there is no problem in creating a new post from the URL in the chrome browser using the plugin JSON API https://localhost/hl-bir/api/create_post/?nonce=5bee184120&title=mypost4&status=publish

Thanks in advance