code: protected void buildClientErrorHeader(StringBuilder sb, String title, Object bean, String name, Object value, Type propertyType,
              String challengeDisp) {
          sb.append(LF).append(LF).append("[").append(title).append("]");
          sb.append(LF).append("Mapping To: ");
          sb.append(bean.getClass().getSimpleName()).append("@").append(name);
          sb.append(" (").append(propertyType.getTypeName()).append(")");
          sb.append(LF).append("Requested Value: ");
          if (value != null) {
              final String exp = value.toString();
              sb.append(exp.contains(LF) ? LF : "").append(exp);
          } else {
              sb.append("null");
          }
          if (challengeDisp != null && challengeDisp.length() > 0) {
              sb.append(LF).append(buildDebugChallengeTitle());
              sb.append(challengeDisp); // debugChallenge starts with LF
          }
      }
docs: ============