internal const val B0_FLAG_FIN = 128

  /** Byte 0 reserved flag 1. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV1 = 64

  /** Byte 0 reserved flag 2. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV2 = 32

  /** Byte 0 reserved flag 3. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV3 = 16

  /** Byte 0 mask for the frame opcode. */

     * @return true if in background mode, false otherwise.
     */
    public boolean isBackground() {
        return background;
    }

    /**
     * Sets the background mode for the crawler.
     * If true, the execute method will not wait for termination.
     * @param background true to run in background, false otherwise.
     */
    public void setBackground(final boolean background) {

     *
     * @return true if the crawler is running, false otherwise
     */
    public boolean isCrawlerRunning() {
        return crawlerRunning;
    }

    /**
     * Sets the crawler running status.
     *
     * @param crawlerRunning true to indicate the crawler is running, false otherwise
     */
    public void setCrawlerRunning(final boolean crawlerRunning) {

Sensitive security-related issues should be reported to [******@****.***](mailto:******@****.***).
See the [security policy](https://golang.org/security) for details.

The recommended way to file an issue is by running `go bug`.
Otherwise, when filing an issue, make sure to answer these five questions:

1. What version of Go are you using (`go version`)?
2. What operating system and processor architecture are you using?
3. What did you do?

     */
    /**
     * Checks if the rule manager contains the specified rule.
     * @param rule the rule to check for
     * @return true if the rule is present, false otherwise
     */
    @Override
    public boolean hasRule(final Rule rule) {
        return ruleList.contains(rule);
    }

    /*
     * (non-Javadoc)
     *
     * @see

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