Android 使用HttpURLConnection进行GET请求时返回406错误?

HttpURLConnection用GET方式请求一个http接口,接口返回的是一个json文件,报406错误
代码:
URL url = new URL(urlstr);
connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(50000);
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();//这里返回406
if (responseCode == 200) {
    is = connection.getInputStream();
    ......
}

如果设置connection.setRequestProperty("accept", "*/*");这句则会返回405,
请问这是什么原因?有谁遇到过?
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