java 调用 rest 接口 怎么写请求行的信息？

Rest接口格式：每一个请求通常由三部分组成：请求行、请求报头、请求正文(可选)。

请求样例：
Post /services/ita/login HTTP/1.1
Host: https://:
Accept:application/json;charset=UTF-8;Content-Type:application/json; charset=UTF-8
Accept-Language:zh_CN
X-Auth-User:user
X-Auth-Key:password

    通过下面的代码，我可以设置请求属性。
        URL httpurl = new URL(url);
        HttpURLConnection conn = (HttpURLConnection) httpurl.openConnection();
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setUseCaches(false);
        conn.setDefaultUseCaches(false);
        conn.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
        conn.setRequestProperty("Content-Length", String.valueOf(xml.length()));
        conn.setRequestProperty("SOAPAction", "");
        conn.setConnectTimeout(60*1000);
        conn.setReadTimeout(60*1000);
        conn.setRequestMethod("POST");

        但是怎么在java代码里写请求行：Post <basic_uri>/services/ita/login HTTP/1.1的信息呢？

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