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有人可以提供一个例子并解释如何使用这种方法吗？我是 Reactor 项目的新手，我很难理解使用它的方式，而且那里似乎没有足够的教程。我想要的是调用一个服务，它将以字符串格式返回一个主机名，然后我想将其作为 uri 用户

这是方法的包和方法：

org.springframework.cloud.gateway.route.builder



/**
 * A filter which change the URI the request will be routed to by the Gateway.
 * @param determineRequestUri a {@link Function} which takes a
 * {@link ServerWebExchange} and returns a URI to route the request to
 * @return a {@link GatewayFilterSpec} that can be used to apply additional filters
 */
public GatewayFilterSpec changeRequestUri(Function<ServerWebExchange, Optional<URI>> determineRequestUri) {
    return filter(new AbstractChangeRequestUriGatewayFilterFactory<Object>(Object.class) {
        @Override
        protected Optional<URI> determineRequestUri(ServerWebExchange exchange, Object config) {
            return determineRequestUri.apply(exchange);
        }
    }.apply(c -> {
    }));
}
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