class DirectBasicAuthClient extends DirectClient {

    private String realmName = Pac4jConstants.DEFAULT_REALM_NAME;

    /**
     * <p>Constructor for DirectBasicAuthClient.</p>
     */
    public DirectBasicAuthClient() {
    }

    /**
     * <p>Constructor for DirectBasicAuthClient.</p>
     *
     * @param usernamePasswordAuthenticator a {@link Authenticator} object
     */
    public DirectBasicAuthClient(final Authenticator usernamePasswordAuthenticator) {
        setAuthenticatorIfUndefined(usernamePasswordAuthenticator);
    }

    /**
     * <p>Constructor for DirectBasicAuthClient.</p>
     *
     * @param usernamePasswordAuthenticator a {@link Authenticator} object
     * @param profileCreator a {@link ProfileCreator} object
     */
    public DirectBasicAuthClient(final Authenticator usernamePasswordAuthenticator,
                                 final ProfileCreator profileCreator) {
        setAuthenticatorIfUndefined(usernamePasswordAuthenticator);
        setProfileCreatorIfUndefined(profileCreator);
    }

    /** {@inheritDoc} */
    @Override
    protected void internalInit(final boolean forceReinit) {
        assertNotBlank("realmName", this.realmName);

        setCredentialsExtractorIfUndefined(new BasicAuthExtractor());
    }

    /** {@inheritDoc} */
    @Override
    public Optional<Credentials> getCredentials(final CallContext ctx) {
        addAuthenticateHeader(ctx.webContext());

        return super.getCredentials(ctx);
    }

    /**
     * <p>addAuthenticateHeader.</p>
     *
     * @param context a {@link WebContext} object
     */
    protected void addAuthenticateHeader(final WebContext context) {<FILL_FUNCTION_BODY>}
}

        // set the www-authenticate in case of error
        context.setResponseHeader(HttpConstants.AUTHENTICATE_HEADER, "Basic realm=\"" + realmName + "\"");
    
<methods>public non-sealed void <init>() ,public final Optional<org.pac4j.core.exception.http.RedirectionAction> getLogoutAction(CallContext, org.pac4j.core.profile.UserProfile, java.lang.String) ,public final Optional<org.pac4j.core.exception.http.RedirectionAction> getRedirectionAction(CallContext) ,public final org.pac4j.core.exception.http.HttpAction processLogout(CallContext, org.pac4j.core.credentials.Credentials) <variables>