in src/main/java/com/twitter/joauth/keyvalue/KeyValueHandler.java [204:211]
public void handle(String key, String value) {
if (invoked) {
if (_key != null) _key = null;
} else {
invoked = true; //TODO: bug? should invoked be set to true, if _key is not set?
if (value == null || value.equals("")) _key = key;
}
}