Retrofit intercept替换url

public class DomainInterceptor implements Interceptor {
    public static final String TAG = "DomainInterceptor";
    
    @Override
    public Response intercept(Chain chain) throws IOException {

        Request request = chain.request();

        if(true){
            Request.Builder builder = request.newBuilder();


         //   String url = list.get(new Random().nextInt(list.size()));
            
            HttpUrl newBaseUrl = HttpUrl.parse(url);
            
            HttpUrl oldHttpUrl = request.url();
            HttpUrl newFullUrl = oldHttpUrl
                    .newBuilder()
                    .scheme(newBaseUrl.scheme())
                    .host(newBaseUrl.host())
                    .port(newBaseUrl.port())
                    .build();

            Response response = chain.proceed(builder.url(newFullUrl).build());

            return response;

        }else {
            return chain.proceed(request);
        }
    }
}