GitHub OAuth Application CORS Error

[Timschmid]

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Hey,
I have an Angular Application where I try to authorize via an OAuth App in GitHub.
The Website is hosted on GitHub Pages. That's My Code, where I call the OAuth2 App

public async login(){
        const headers = new HttpHeaders({'Access-Control-Allow-Origin': '*'});
        //await window.location.assign("https://github.com/login/oauth/authorize?client_id=" + clientId)
        this.hhtp
        .get<any>("https://github.com/login/oauth/authorize?client_id=" + clientId,  {headers: headers})
        .pipe()
        .subscribe((data: any) => {
          console.log(data)
        })
   }

My problem is, when I try to make a get Request, I get CORS Errors, and it seems, that GitHub OAUTH.2.0 does not support Cross Origin for Web Application, but why?

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