In what way can actix middleware retrieve the response body and change the headers?

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Actix middleware can retrieve the response body and change the headers by implementing the Middleware trait and implementing its fn response method.

The response method takes two arguments: a Request object and a ServiceResponse object. The ServiceResponse object contains the response body and headers.

To retrieve the response body, middleware can call the response.take_body() method, which consumes the ServiceResponse object and returns the response body as a Body object.

To change the headers, middleware can access the ServiceResponse object's headers through its headers_mut() method and modify them as needed.

Once the changes to the response body and headers have been made, the middleware can return a new ServiceResponse object using the ServiceResponse::new() method, passing in the modified headers and response body as arguments.