Fess basiert auf [OpenSearch](https://github.com/opensearch-project/OpenSearch), aber es ist kein Wissen oder Erfahrung mit OpenSearch erforderlich. Fess bietet eine einfach zu bedienende Administrations-GUI zur Konfiguration des Systems über Ihren Browser.

Fess is based on [OpenSearch](https://github.com/opensearch-project/OpenSearch), but knowledge/experience about OpenSearch is _not_ required. Fess provides an easy to use Administration GUI to configure the system via your browser.

    }

    /**
     * Extracts and normalizes language preferences from request parameters or browser locale.
     *
     * This method prioritizes explicit language parameters over browser locale settings
     * and handles special cases like "all languages" selection.
     *
     * @param request The HTTP servlet request

        }
        return OptionalObject.empty();
    }

    @Override
    public OptionalThing<Locale> getRequestedLocale(final RequestManager requestManager) {
        return OptionalObject.empty(); // means browser default
    }

    // ===================================================================================
    //                                                                      Basic Override

## Language Detection and Selection

### User Interface Language

Fess determines the UI language in this order:

1. **Query parameter**: `?browser_lang=[locale]` (highest priority)
2. **Browser header**: `Accept-Language` header
3. **Fallback**: English (from `fess_label.properties` and `fess_message.properties`)

### Document Language Detection

During crawling and indexing, Fess:

    public static final String GOOGLE_CHAT_WEBHOOK_URLS_PROPERTY = "google.chat.webhook.urls";

    /** Property key for browser locale usage in search configuration. */
    public static final String USE_BROWSER_LOCALE_FOR_SEARCH_PROPERTY = "search.use.browser.locale";

    // ============================================================
    // Suggest and LTR Property Keys

        }
        // http, ftp
        // nothing

        return appendQueryParameter(document, url);
    }

    /**
     * Updates file protocol based on user agent type.
     * Handles different browser-specific file protocol formats.
     *
     * @param url the file URL to update
     * @return the updated URL with appropriate file protocol
     */
    protected String updateFileProtocol(String url) {

    }

    default String[] getQueryLanguages(final Enumeration<Locale> locales, final String[] requestLangs) {
        // requestLangs > default > browser
        if (StringUtil.isNotBlank(getQueryDefaultLanguages())) {
            String[] langs = (String[]) propMap.get(QUERY_DEFAULT_LANGUAGES);
            if (langs == null) {

query.timeout.logging=true
# Maximum number of total hits to track in queries.
query.track.total.hits=10000
# Fields used for geo search queries.
query.geo.fields=location
# Parameter name for browser language in queries.
query.browser.lang.parameter.name=browser_lang
# Whether to replace term with prefix query.
query.replace.term.with.prefix.query=true
# Minimum hit count for OR search queries.
query.orsearch.min.hit.count=-1

     */
    String getQueryGeoFields();

    /**
     * Get the value for the key 'query.browser.lang.parameter.name'. <br>
     * The value is, e.g. browser_lang <br>
     * comment: Parameter name for browser language in queries.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */