Bug on Android Core API

Thanks! I'm working on reproducing this, but I can't seem to get the SDK to give me a URL that doesn't have the "https://" at the beginning, which seems to be the important difference, per the exception in your posted log. The URL is built by RESTUtility.buildURL in com/dropbox/client2/RESTUtility.java. That only returns either null (in case of an UnsupportedEncodingException) or:

return "https://" + host + ":443" + target;

Is your RESTUtility.buildURL modified by any chance?

Otherwise, can you try adding some logging to see if/where it's getting modified? E.g., something like this between RESTUtility.buildURL and Intent intent = new Intent... in startWebAuth:

Log.d("TEST", "url: " + url);
Log.d("TEST", "parsed URI: " + Uri.parse(url));