How can I read binary data (a PNG) thru an application link?

I am reading a PNG file from JIRA into Conflunece using an application link. The PNG in JIRA is 46548 bytes, but the String response is only 28076. The difference is due to a loss of encoding. The original PNG appears to be UTF-8 but the app link interface appears to be using US-ASCII. Is there an option in RequestFactory to specify the encoding?

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This widget could not be displayed.

never mind, figured it out .. have to read Ints and convert to chars. This avoids the Charset interpretation

  String ainput=""



                       InputStream inStream = response.getResponseBodyAsStream();

                       int inb = 0;

                       while ( inb != -1 ) {

                         inb =;

                         aInput += (char) inb;






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