*
     * @param url the URL to check
     * @return true if the URL uses a file path protocol (smb, smb1, file, ftp, s3, gcs)
     */
    public boolean isFilePathProtocol(final String url) {
        return url.startsWith("smb:") || url.startsWith("smb1:") || url.startsWith("file:") || url.startsWith("ftp:")
                || url.startsWith("s3:") || url.startsWith("gcs:");
    }

- **Testing**: JUnit 4, UTFlute, Mockito, Testcontainers
- **Storage**: In-memory (default), OpenSearch (optional)
- **Cloud**: AWS SDK v2 (S3), Google Cloud Storage

### Protocols

HTTP/HTTPS, File, FTP/FTPS, SMB/CIFS (SMB1/SMB2+), Storage (MinIO via `storage://`), S3 (`s3://`), GCS (`gcs://`)

### Content Formats

                "file://home/taro/あ.txt");

        // smb->file
        assertUrlLink("smb:/home/taro/test.txt", //
                "file://home/taro/test.txt");
        assertUrlLink("smb:/home/taro/あ.txt", //
                "file://home/taro/あ.txt");
        assertUrlLink("smb:/home/taro/%E3%81%82.txt", //
                "file://home/taro/%E3%81%82.txt");

        assertEscapePattern("\\Qhttp://www.codelibs.org/\\E.*", "http://www.codelibs.org/");
        assertEscapePattern("\\Qsmb://server/test/\\E.*", "smb://server/test/");
        assertEscapePattern(".*\\Q?\\E.*", "contains:?");
        assertEscapePattern(".*\\Q\001\\E.*", "contains:\001");
        assertEscapePattern("(?i).*\\.exe$", "regexpIgnoreCase:\\.exe$");

				<property name="notModifiedHttpCodes">(int[])[304]</property>
			</component>
		</property>
		<property name="allRequired">true</property>
		<postConstruct name="addRule">
			<arg>"url"</arg>
			<arg>"(file|smb|smb1|ftp):.*"</arg>
		</postConstruct>
		<postConstruct name="addRule">
			<arg>"mimeType"</arg>
			<!-- Supported MIME type -->
			<arg>
  "(application/xml"
+ "|application/xhtml\+xml"

# OSX leaves these everywhere on SMB shares
._*

# OSX trash
.DS_Store

# Developers can store local stuff in dirs named __something
__*

# Eclipse files
.classpath
.project
.settings/**

# Files generated by JetBrains IDEs, e.g. IntelliJ IDEA
.idea/
*.iml

# Vscode files
.vscode

# This is where the result of the go build goes
/output*/
/_output*/
/_output

# Emacs save files
*~
\#*\#

-XX:MaxGCPauseMillis=60000\n\
-XX:G1NewSizePercent=5\n\
-XX:G1MaxNewSizePercent=5\n\
-Djcifs.smb.client.responseTimeout=30000\n\
-Djcifs.smb.client.soTimeout=35000\n\
-Djcifs.smb.client.connTimeout=60000\n\
-Djcifs.smb.client.sessionTimeout=60000\n\
-Djcifs.smb1.smb.client.connTimeout=60000\n\
-Djcifs.smb1.smb.client.soTimeout=35000\n\
-Djcifs.smb1.smb.client.responseTimeout=30000\n\
-Dio.netty.noUnsafe=true\n\

            final String fileName = new File(filePath).getName();
            int colonIndex = fileName.indexOf(":");
            if (colonIndex == -1) {
                colonIndex = fileName.indexOf("\\\\"); // Windows SMB
            }
            final int backslashIndex = fileName.lastIndexOf("\\");
            if (colonIndex > -1 && backslashIndex > -1) {
                return fileName.substring(backslashIndex + 1);
            }

     * -XX:G1MaxNewSizePercent=5<br>
     * -Djcifs.smb.client.responseTimeout=30000<br>
     * -Djcifs.smb.client.soTimeout=35000<br>
     * -Djcifs.smb.client.connTimeout=60000<br>
     * -Djcifs.smb.client.sessionTimeout=60000<br>
     * -Djcifs.smb1.smb.client.connTimeout=60000<br>
     * -Djcifs.smb1.smb.client.soTimeout=35000<br>
     * -Djcifs.smb1.smb.client.responseTimeout=30000<br>
     * -Dio.netty.noUnsafe=true<br>

    public void test_isValidUrl_withCustomScheme() {
        final FessXpathTransformer transformer = new FessXpathTransformer();
        // topic/2732: java.net.URL does not support smb:// scheme, so isValidUrl returns false
        assertFalse(transformer.isValidUrl("smb://server/share/file"));
    }

    @Test
    public void test_normalizeCanonicalUrl_malformedReturnsNull() throws Exception {