Java i'；我正在尝试构建url，但遇到异常

这是错误=> java.lang.IllegalArgumentException:意外主机：localhost:8080

它是：

HttpUrl url = new HttpUrl.Builder().scheme("http")
                .host("localhost:8080") // here I'm getting error
                .addPathSegment("organization").build();

它是：

HttpUrl url = new HttpUrl.Builder().scheme("http")
            .host("localhost")
            .port(8080)
            .addPathSegment("organization").build();