我正在尝试从 ionic 应用程序将数据发送到 Google 云功能，但不断收到以下错误：

从源“http://localhost:8100”访问“https://xxxxxxxxxxxxxxx.cloudfunctions.net/upload_data”处的 XMLHttpRequest 已被 CORS 策略阻止：Access 不允许请求标头字段内容类型-预检响应中的 Control-Allow-Headers。

即使删除请求标头，也会显示相同的错误。 如果有一点帮助，我们将不胜感激，谢谢。

我的打字稿代码：

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);   
        });

python云函数：

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 `.
    """
    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)