Android, SDK 26 upgrade

org.apache.http is deprecated. > HttpUrlConnection


- 301 error

} else if (responseCode == HttpURLConnection.HTTP_MOVED_PERM
            || responseCode == HttpURLConnection.HTTP_MOVED_TEMP){

    // redirectionのため
    String redirectedUrl = connection.getHeaderField("Location");
    // do connect one more with redirectedUrl
}

http://love4rh.blogspot.com/2013/05/httpurlconnection-301-302.html