https://deimos.apple.com/WebObjects/Core.woa/Browsev2/Example.edu.42?​credentials=Administrator%40urn%3Amace%3Aitunesu.com%3Asites%3Aexample.edu​&identity=%22Jane+Doe%22+%3Cjanedoe%40example.edu%3E+%28jdoe%29+%5B42%5D​&time=1147136717&signature=597c304e90fb62067c7e3fa57fe824e77997dd8aa96649366c5fc59104074744

/**
     * Send a request for an action to iTunes U with an authorization token.
     *
     * @param url URL defining how to communicate with iTunes U and 
     *          identifying which iTunes U action to invoke and which
     *          iTunes U page or item to apply the action to. Such URLs have
     *          a format like <CODE>[PREFIX]/[ACTION]/[DESTINATION]</CODE>,
     *          where <CODE>[PREFIX]</CODE> is a value like
     *          "https://deimos.apple.com/WebObjects/Core.woa" which defines
     *          how to communicate with iTunes U, <CODE>[ACTION]</CODE> is
     *          a value like "Browse" which identifies which iTunes U action
     *          to invoke, and <CODE>[DESTINATION]</CODE> is a value like
     *          "example.edu" which identifies which iTunes U page or item to
     *          apply the action to. The destination string "example.edu"
     *          refers to the root page of the iTunes U site identified by
     *          the domain "example.edu". Destination strings for other items
     *          within that site contain the site domain followed by
     *          numbers separated by periods. For example: 
     *          "example.edu.123.456.0789". You can find these strings in the
     *          items' URLs, which you can obtain from iTunes. See the
     *          iTunes U documentation for details.
     * @param token Authorization token generated by getAuthorizationToken().
     *
     * @return The iTunes U response, which may be HTML or
     *         text depending on the type of action invoked.
     */
    public String invokeAction(String url, String token) {

        // Send a request to iTunes U and record the response.
        StringBuffer response = null;
        try {

            // Verify that the communication will be over SSL.
            if (!url.startsWith("https")) {
                throw new MalformedURLException(
                    "ITunesU.invokeAction(): URL \""
                    + url + "\" does not use HTTPS.");
            }

            // Create a connection to the requested iTunes U URL.
            HttpURLConnection connection =
                    (HttpURLConnection)new URL(url).openConnection();
            connection.setUseCaches(false);
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.setRequestProperty(
                    "Content-Type",
                    "application/x-www-form-urlencoded; charset=UTF-8");
            // Send the authorization token to iTunes U.
            connection.connect();
            OutputStream output = connection.getOutputStream();
            output.write(token.getBytes("UTF-8"));
            output.flush();
            output.close();

            // Read iTunes U's response.
            response = new StringBuffer();
            InputStream input = connection.getInputStream();
            Reader reader = new InputStreamReader(input, "UTF-8");
            reader = new BufferedReader(reader);
            char[] buffer = new char[16 * 1024];
            for (int n = 0; n >= 0;) {
                n = reader.read(buffer, 0, buffer.length);
                if (n > 0) response.append(buffer, 0, n);
            }

            // Clean up.
            input.close();
            connection.disconnect();

        } catch (UnsupportedEncodingException e) {

            // ITunes U requires UTF-8 and ASCII encoding support.
            throw new java.lang.AssertionError(
                    "ITunesU.invokeAction(): UTF-8 encoding not supported!");

        } catch (IOException e) {

            // Report communication problems.
            throw new java.lang.AssertionError(
                    "ITunesU.invokeAction(): I/O Exception " + e);

        }

        // Return the response received from iTunes U.
        return response.toString();

    }