不允许android httpurlconenction请求方法405

Responsecode将405返回给我，我不明白应用代码中的错误在哪里？我正在使用httpurlconnection连接到internet

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对于GET请求，删除

conn.setDoOutput（true）行。但是，我认为这应该是POST请求。替换
conn.setRequestMethod（“GET”）
通过
conn.setRequestMethod（“POST”）然后再次运行应用程序。
添加标题是否不起作用？我正在使用setRequestProperty吗？
        HttpURLConnection conn = (HttpURLConnection) url2.openConnection();
                conn.setReadTimeout(60000);
                conn.setConnectTimeout(60000);
                conn.setRequestMethod("GET");
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.setRequestProperty("Cache-Control", "no-cache");
                String sessionId = "JSESSIONID=" + Common.getAuthCode();
                conn.setRequestProperty("Cookie", sessionId);
                conn.setRequestProperty("User-Agent",System.getProperty("http.agent"));
                OutputStream os = conn.getOutputStream();
                BufferedWriter writer = new BufferedWriter(
                        new OutputStreamWriter(os, "UTF-8"));                   
                writer.write(getQuery(params));
                writer.flush();
                writer.close();
                os.close();
                conn.connect();
                int status = conn.getResponseCode();
                System.out.println("statue "+status);
                switch (status) {
                    case 200:
                    case 201:
                        BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                        StringBuilder sb = new StringBuilder();
                        String line;
                        while ((line = br.readLine()) != null) {
                            sb.append(line+"\n");
                        }
                        br.close();
                        System.out.println("here");
                        return sb.toString();
                }