public class BaseIntercepter implements Interceptor {
    private Context mContext;
    //快取有效期
    private static final long CACHE_STALE_SEC = 60 * 60 * 24 * 2;
    private String token;
    public BaseIntercepter(Context context) {
        mContext = context;
    }

    public void setToken(String token){
        this.token = token;
    }
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();

        LogUtil.e("net","網路:"+NetUtil.isConnected(mContext));
        if (!NetUtil.isConnected(mContext)){
            request = request.newBuilder().cacheControl(CacheControl.FORCE_CACHE)
                    .build();
        }
        request = request.newBuilder().header("token",token).build(); //加入token
        Response originalResponse = chain.proceed(request);

        if (NetUtil.isConnected(mContext)){
            //有網的直接讀取介面上@Headers的配置，實現某個請求的線上快取
            String cacheControl = request.cacheControl().toString();
            //有網的時候統一處理快取,將其超時時間這是為0：不需要快取
            //String cacheControl="Cache-Control:public,max-age=0"
            return originalResponse.newBuilder()
                    .header("Cache-Control", cacheControl)
                    .removeHeader("Pragma")//清除頭資訊，如果伺服器不支付回返回干擾資訊，不清除沒法生效
                    .build();
        }else{
            return originalResponse.newBuilder()
                    .removeHeader("Pragma")
                    .header("Cache-Control", "public, only-if-cached, max-stale=" + CACHE_STALE_SEC)
                    .build();
        }
    }
}