HttpUrlConnection使用Java的PATCH请求

我试图做一个HTTP PATCH请求，但我总是得到404错误，所以也许我的连接设置不正确：

URL url = new URL("MyPath"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setDoOutput(true); conn.setRequestProperty("X-HTTP-Method-Override", "PATCH"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("Accept", "application/json"); conn.setRequestMethod("POST"); JsonObject jo = createMyJson(); OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream()); out.write(jo.toString()); out.close(); System.out.println(conn.getResponseCode()); System.out.println(conn.getResponseMessage()); 

我得到了404错误，找不到。 当使用邮差做同样的请求，这是工作..谢谢你的帮助。