Saya cuba menghantar data ke Google Cloud Functions daripada apl ionik tetapi saya terus mendapat ralat berikut:

Akses kepada XMLHttpRequest di 'https://xxxxxxxxxxxxxxx.cloudfunctions.net/upload_data' dari asal 'http://localhost:8100' telah disekat oleh dasar CORS: Akses tidak membenarkan jenis kandungan medan pengepala permintaan - dalam respons pra penerbangan Kawalan- Benarkan-Tajuk.

Walaupun semasa mengalih keluar pengepala permintaan, ralat yang sama ditunjukkan. Sebarang bantuan amatlah dihargai, terima kasih.

Kod skrip taip saya:

var httpheader = new HttpHeaders();
    
    httpheader.append('Accept','application/json');
    httpheader.append('Content-Type','application/json');
  
     let data = {"testbody":"this is test data"};
      
      await this.http.post('https://xxxxxxxxxxxxxxxx.cloudfunctions.net/upload_data',data
      ,{headers:httpheader}).subscribe((resp)=>{
          console.log(resp);   
        });

fungsi awan python:

def hello_world(request):
    """Responds to any HTTP request.
    Args:
        request (flask.Request): HTTP request object.
    Returns:
        The response text or any set of values that can be turned into a
        Response object using
        `make_response <http://flask.pocoo.org/docs/1.0/api/#flask.Flask.make_response>`.
    """
    if request.method == 'OPTIONS':
        headers={'Access-Control-Allow-Origin':'*',
                'Access-Control-Allow-Methods':'GET',
                'Access-Control-Allow-Headrs':'Content-Type',
                'Access-Control-Max-Age':'3600'
        }
        return ('',204,headers)
    headers={'Access-Control-Allow-Origin':'*'}
    
    request_json = request.get_json(silent=True)
    request_args = request.args
    
    if request_json and 'testbody' in request_json:
        testname = request_json['testbody']
    elif request_args and 'testbody' in request_args:
        testname = request_args['testbody']
    else:
        testname = 'Nothing sent'
    return (jsonify(testname),200,headers)