logger.debug("Failed to retrieval a cache.", e);
            }
            return new XPathAPI();
        }
    }

    /**
     * Creates and configures a DOM parser with the specified features and properties.
     *
     * @return a configured DOM parser instance
     * @throws CrawlerSystemException if the parser configuration is invalid
     */
    protected DOMParser getDomParser() {

      var result = pattern.hashCode()
      result = 31 * result + hashAlgorithm.hashCode()
      result = 31 * result + hash.hashCode()
      return result
    }
  }

  /** Builds a configured certificate pinner. */
  class Builder {
    val pins = mutableListOf<Pin>()

    /**
     * Pins certificates for `pattern`.
     *

            rotationTask = rotationScheduler.scheduleWithFixedDelay(this::rotateExpiredKeys, intervalMillis, intervalMillis,
                    java.util.concurrent.TimeUnit.MILLISECONDS);
            log.info("Key rotation configured with interval: {} ms", intervalMillis);
        }
    }

    /**
     * Rotate a specific session key
     *
     * @param sessionId the session ID
     * @return the new key version number

            logger.warn("Failed to parse the content by {}", path, e);
            return StringUtil.EMPTY_STRINGS;
        }

    }

    /**
     * Creates and configures a DOM parser for parsing HTML content.
     *
     * @return a configured DOMParser instance
     * @throws CrawlerSystemException if the parser configuration is invalid
     */
    protected DOMParser getDomParser() {

/**
 * Policy on when async requests are executed.
 *
 * Each dispatcher uses an [ExecutorService] to run calls internally. If you supply your own
 * executor, it should be able to run [the configured maximum][maxRequests] number of calls
 * concurrently.
 */
class Dispatcher() {
  /**
   * The maximum number of requests to execute concurrently. Above this requests queue in memory,

 *   <li>Execution: Starts the crawler threads and waits for them to complete.</li>
 *   <li>Cleanup: Deletes the crawled data and clears the URL filter.</li>
 * </ol>
 *
 * <p>The crawler can be configured with various parameters, such as the number of threads,
 * the maximum depth of crawling, and URL filters.
 *
 * <p>Example usage:
 * <pre>
 *   Crawler crawler = new Crawler();

It would probably all start by you **acquiring** some **domain name**. Then, you would configure it in a DNS server (possibly your same cloud provider).

You would probably get a cloud server (a virtual machine) or something similar, and it would have a <abbr title="That doesn't change">fixed</abbr> **public IP address**.

In the DNS server(s) you would configure a record (an "`A record`") to point **your domain** to the public **IP address of your server**.

            newValue = newValue.replace(element, replacement);
        }
        return newValue;
    }

    /**
     * Builds the complete query string from the configured parameters.
     * Combines base query, extra queries, field filters, and sort field into a single query string.
     *
     * @return the complete formatted query string
     */
    public String build() {

      // fired. To avoid this we substitute a placeholder service.
      logger
          .get()
          .log(
              Level.WARNING,
              "ServiceManager configured with no services.  Is your application configured"
                  + " properly?",
              new EmptyServiceManagerWarning());
      copy = ImmutableList.<Service>of(new NoOpService());
    }

first connect fails. This is necessary for IPv4+IPv6 and services hosted in redundant data
centers. OkHttp supports modern TLS features (TLS 1.3, ALPN, certificate pinning). It can be
configured to fall back for broad connectivity.

Using OkHttp is easy. Its request/response API is designed with fluent builders and immutability. It
supports both synchronous blocking calls and async calls with callbacks.