* @param callbackName The callback name.
     * @return The escaped callback name.
     */
    protected String escapeCallbackName(final String callbackName) {
        return "/**/" + callbackName.replaceAll("[^0-9a-zA-Z_\\$\\.]", StringUtil.EMPTY);
    }

    /**
     * Escapes a JSON object.
     * @param obj The object to escape.
     * @return The escaped object.
     */

 * start of the URL's query. But within the query and fragment components, the `?` character
 * doesn't delimit anything and doesn't need to be escaped.
 *
 * ```java
 * HttpUrl url = HttpUrl.parse("http://who-let-the-dogs.out").newBuilder()
 *     .addPathSegment("_Who?_")
 *     .query("_Who?_")
 *     .fragment("_Who?_")
 *     .build();

    to configure it on that platform.

 *  New: `HttpUrl.addQueryParameter()` percent-escapes more characters.
    Previously several ASCII punctuation characters were not percent-escaped
    when used with this method. This does not impact already-encoded query
    parameters in APIs like `HttpUrl.parse()` and
    `HttpUrl.Builder.addEncodedQueryParameter()`.