调用setRequestMethod("get")方法，弹出错误

HttpURLConnection httpConn;
            try {
                URL url=new URL(path);
                httpConn = (HttpURLConnection)url.openConnection();
                httpConn.setConnectTimeout(5*1000);
                httpConn.setRequestMethod("get");
                int code=httpConn.getResponseCode();    
                Log.d(tag,"Responsecode is "+code);
                InputStream ipStream=httpConn.getInputStream();
                int len=-1;
                ByteArrayOutputStream otStream=new ByteArrayOutputStream();
                while((len=ipStream.read(bt))!=-1){
                  otStream.write(bt, 0, len);
                }
                ipStream.close();
                otStream.close();
                return otStream.toByteArray();
            
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
                Log.d(tag, "IOException.."+e1.toString());
            }