response header "Server' cannot modified

I want to change response header "Server',use th code

@app.after_request def after_request(response): response.headers['Server'] = 'WebServer' response.headers['Server2'] = 'WebServer' return response

After testing, it was found that response headers "Server' not modified, response header "Server2' is modified.

Server: Werkzeug/3.0.1 Python/3.11.5 Server2: WebServer

Would you like to know how to modify the response header "Server", thanks .