You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: capture.go
    path of file: ./repos/traefik/pkg/middlewares/capture
    
    the code of the file until where you have to start completion: // Package capture is a middleware that captures requests/responses size, and status.
//
// For another middleware to get those attributes of a request/response, this middleware
// should be added before in the middleware chain.
//
//	chain := alice.New().
//	     Append(capture.Wrap).
//	     Append(myOtherMiddleware).
//	
    
func (c *Capture) renew(rw http.ResponseWriter, req *http.Request) (http.ResponseWriter, *http.Request) {
	ctx := context.WithValue(req.Context(), capturedData, c)
	newReq := req.WithContext(ctx)

	if newReq.Body != nil {
		readCounter := &readCounter{source: newReq.Body}
		c.rr = readCounter
		newReq.Body = readCounter
	}
	c.crw = &captureResponseWriter{rw: rw}

	return c.crw, newReq
}