}
    }

    // Test with different hostnames
    @Test
    public void test_differentHostnames() {
        String[] hostnames = { "smtp.gmail.com", "mail.example.com", "localhost", "192.168.1.1" };

        for (String hostname : hostnames) {
            ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {

The following arguments are supported:

* `allowed_hosts` - A list of domain names that should be allowed as hostnames. Wildcard domains such as `*.example.com` are supported for matching subdomains. To allow any hostname either use `allowed_hosts=["*"]` or omit the middleware.

organization-specific certificate authority.

By default `HeldCertificate` instances expire after 24 hours. Use `duration()` to adjust.

By default server certificates need to identify which hostnames they're trusted for. You may add as
many as necessary with `addSubjectAlternativeName()`. This mechanism also supports a very limited
form of wildcards `*.example.com` where the `*` must be first and doesn't match nested subdomains.

attacks, this setting and default was backported to Go 1.25.6 and Go 1.24.12.

Go 1.26 added a new `urlstrictcolons` setting that controls whether `net/url.Parse`
allows malformed hostnames containing colons outside of a bracketed IPv6 address.
The default `urlstrictcolons=1` rejects URLs such as `http://localhost:1:2` or `http://::1/`.
Colons are permitted as part of a bracketed IPv6 address, such as `http://[::1]/`.

    }

    /**
     * Set the value of hostname, used in parameter comment. <br>
     * Even if empty string, treated as empty plainly. So "IF pmb != null" is false if empty.
     * @param hostname The parameter value of hostname. (NotNull)
     */
    public void setHostname(String hostname) {
        registerVariable("hostname", hostname);
    }

    /**

                // State has changed
                return true;
            }

            @Override
            public String getHostname() {
                return "test-hostname";
            }
        };

        FessConfig fessConfig = createTestFessConfig();

        // Register components
        ComponentUtil.register(searchEngineClient, "searchEngineClient");

        final String hostname = ComponentUtil.getSystemHelper().getHostname();
        final String targetName = ComponentUtil.getFessConfig().getSchedulerTargetName();

        final String body = toJson(Map.of( //
                "type", TYPE_HEARTBEAT, //
                "instanceId", instanceId, //
                "hostname", hostname, //

                                    <label for="hostname" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.file_auth_hostname"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="hostname"/>
                                        <la:text styleId="hostname" property="hostname" styleClass="form-control"/>

                                    <label for="hostname" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.webauth_hostname"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="hostname"/>
                                        <la:text styleId="hostname" property="hostname" styleClass="form-control"/>

                                                                test="${data.hostname==null||data.hostname==''}">
                                                            <la:message key="labels.file_auth_any"/>
                                                        </c:if> ${f:h(data.hostname)}: <c:if
                                                                test="${data.port==null||data.port==''}">