default String[] getCrawlerDocumentSpaces() {
        String[] spaces = (String[]) propMap.get(CRAWLER_DOCUMENT_SPACES);
        if (spaces == null) {
            spaces = Arrays.stream(getCrawlerDocumentSpaceCharsAsArray()).mapToObj(Character::toString).toArray(n -> new String[n]);
            propMap.put(CRAWLER_DOCUMENT_SPACES, spaces);
        }
        return spaces;
    }

    }

    /**
     * Escapes a callback name.
     * @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.

    public void test_buildFilePath_encodedCharacters() {
        final Path result = indexExportJob.buildFilePath("/export", "https://example.com/path%20with%20spaces/file.html",
                new HtmlIndexExportFormatter());
        assertEquals(Path.of("/export/example.com/path with spaces/file.html"), result);
    }

    // --- buildHtml() tests ---

    @Test
    public void test_buildHtml_basicDocument() {

        final URL value = transformer.getURL("http://example.com/", "page with spaces");
        // java.net.URL accepts spaces in path (unlike URI)
        assertNotNull(value);
        assertTrue(value.toExternalForm().contains("page with spaces"));
    }

    @Test
    public void test_normalizeCanonicalUrl_withCustomSchemeRelative() throws Exception {

    HTTP/2 server, close all but the first connection.
 *  Fix: Fail the HTTP/2 connection if first frame isn't `SETTINGS`.
 *  Fix: Forbid spaces in header names.
 *  Fix: Don't offer to do gzip if the request is partial.
 *  Fix: MockWebServer is now usable with JUnit 5. That update [broke the rules][junit_5_rules].

	return -1
}

// getServerPoolsAvailableSpace will return the available space of each pool after storing the content.
// If there is not enough space the pool will return 0 bytes available.
// The size of each will be multiplied by the number of sets.
// Negative sizes are seen as 0 bytes.

                    System.currentTimeMillis() - startTime);
            return Collections.emptyList();
        }
    }

    /**
     * Escapes special characters in the value for use in Fess queries.
     *
     * @param value the value to escape
     * @return the escaped value
     */
    protected String escapeQueryValue(final String value) {

            if (StringUtil.isNotBlank(text)) {
                return escapeHighlight(text);
            }
        }

        return StringUtil.EMPTY;
    }

    /**
     * Escapes HTML and applies highlighting to text.
     * Handles boundary position detection if enabled.
     *
     * @param text the text to process
     * @return the escaped and highlighted text
     */

 *
 * Neither of the built-in URL models offer direct access to path segments or query parameters.
 * Manually using `StringBuilder` to assemble these components is cumbersome: do '+' characters get
 * silently replaced with spaces? If a query parameter contains a '&', does that get escaped?
 * By offering methods to read and write individual query parameters directly, application
 * developers are saved from the hassles of encoding and decoding.
 *

                return fessConfig.getRoleSearchGroupPrefix();
            }
        }
        return null;
    }

    /**
     * Escapes special characters in an LDAP search filter to prevent LDAP injection attacks.
     *
     * @param filter the LDAP search filter to escape (null is treated as empty string)