When trying to commit a POST request to the django server I get the following error:

Obj:1 Access to XMLHttpRequest at 'http://localhost:8000/api/' from origin
'http://localhost:4200' has been blocked by CORS policy: Request header field
content-type is not allowed by Access-Control-Allow-Headers in preflight response.

This is the code where I make the request:

return this.http.post(url, data, 
    {headers: new HttpHeaders({
        'Content-Type': 'application/json',
        'Accept': 'application/json',
        'Access-Control-Allow-Headers': 'Content-Type',
    })}
)

And this is my django settup for corsheaders:

CORS_ORIGIN_ALLOW_ALL = True
CORS_ALLOW_HEADERS = ["access-control-allow-origin"]

Any insight on the problem and how to improve the question will be thanked