* Are always invoked once, even if the HTTP response is served from the cache.
 * Observe the application's original intent. Unconcerned with OkHttp-injected headers like `If-None-Match`.
 * Permitted to short-circuit and not call `Chain.proceed()`.
 * Permitted to retry and make multiple calls to `Chain.proceed()`.
 * Can adjust Call timeouts using withConnectTimeout, withReadTimeout, withWriteTimeout.

        final String value = System.getProperty("corelib.timeout_task.num_of_threads");
        if (StringUtil.isNotBlank(value)) {
            try {
                nThreads = Integer.parseInt(value);
            } catch (final NumberFormatException e) {
                logger.warn("Failed to parse " + value, e);
            }
        }
        if (nThreads < 1) {
            nThreads = 1;
        }

        try ( SmbWatchHandle w = this.base.watch(FileNotifyInformation.FILE_NOTIFY_CHANGE_FILE_NAME, false) ) {
            setupWatch(w);
            try ( SmbResource cr = new SmbFile(this.base, "created") ) {
                cr.createNewFile();
                assertNotified(w, FileNotifyInformation.FILE_ACTION_ADDED, "created", null);
            }
        }
        catch ( TimeoutException e ) {

## Handlers & Routes

Handlers have a predefined Handler ID. 
In addition, there can be several *static* subroutes used to differentiate between different handlers of the same ID.
A subroute on a client must match a subroute on the server. So routes cannot be used for dynamic routing, unlike HTTP.

Handlers should remain backwards compatible. If a breaking API change is required, a new handler ID should be created.

## Setup & Configuration

                    }
                } catch (final ChildUrlsException e) {
                    crawlerStatsHelper.record(keyObj, StatsAction.CHILD_URLS);
                    e.getChildUrlList().stream().map(RequestData::getUrl).forEach(urlQueue::offer);
                } catch (final DataStoreCrawlingException e) {

 *   // do stuff
 * } catch (Throwable e) {
 *   // ensure that any checked exception types other than IOException that could be thrown are
 *   // provided here, e.g. throw closer.rethrow(e, CheckedException.class);
 *   throw closer.rethrow(e);
 * } finally {
 *   closer.close();
 * }
 * }</pre>
 *
 * <p>Note that this try-catch-finally block is not equivalent to a try-catch-finally block using

    public static void load(final Properties props, final InputStream in) {
        assertArgumentNotNull("props", props);
        assertArgumentNotNull("in", in);

        try {
            props.load(in);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**
     * {@link Properties#load(Reader)}の例外処理をラップします。
     * <p>
     * 入力リーダはクローズされません。
     * </p>
     *

    ClassWhichDoesNotImplementEquals orig = new ClassWhichDoesNotImplementEquals();
    boolean errorNotThrown = false;
    try {
      SerializableTester.reserializeAndAssert(orig);
      errorNotThrown = true;
    } catch (AssertionFailedError error) {
      // expected
      assertContains("must be Object#equals to", error.getMessage());
    }
    assertFalse(errorNotThrown);
  }

    ClassWhichDoesNotImplementEquals orig = new ClassWhichDoesNotImplementEquals();
    boolean errorNotThrown = false;
    try {
      SerializableTester.reserializeAndAssert(orig);
      errorNotThrown = true;
    } catch (AssertionFailedError error) {
      // expected
      assertContains("must be Object#equals to", error.getMessage());
    }
    assertFalse(errorNotThrown);
  }

                    continue;
                }
                return nr;
            }
            catch ( CIFSException e ) {
                log.error("Failed to apply filter", e);
                continue;
            }
            catch ( MalformedURLException e ) {
                log.error("Failed to create child URL", e);
                continue;
            }
        }
        return null;
    }