src/main/java/org/imsglobal/lti/BasicLTIUtil.java
public static String postLaunchHTML(final Properties cleanProperties,
            String endpoint, boolean debug) {
        Map<String, String> map = convertToMap(cleanProperties);
        return postLaunchHTML(map, endpoint, debug);
    }
public static String postLaunchHTML(final Properties cleanProperties,
            String endpoint, boolean debug) {
        Map<String, String> map = convertToMap(cleanProperties);
        return postLaunchHTML(map, endpoint, debug);
    }
Create the HTML to render a POST form and then automatically submit it.
Make sure to call {@link #cleanupProperties(Properties)} before signing.

@deprecated Moved to {@link #postLaunchHTML(Map, String, boolean)}
@param cleanProperties Assumes you have called
{@link #cleanupProperties(Properties)} beforehand.
@param endpoint The LTI launch url.
@param debug Useful for viewing the HTML before posting to end point.
@return the HTML ready for IFRAME src = inclusion.