public void configureHttpClient(HttpClientBuilder clientBuilder) {
    clientBuilder.setProxy(new HttpHost(host, port, scheme));

    if (username != null && password != null) {
        Credentials defaultcreds;
        if (domain != null) {
            defaultcreds = new NTCredentials(username, password, ntHost, domain);
        } else {
            defaultcreds = new UsernamePasswordCredentials(username, password);
        }
        BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, defaultcreds);
        clientBuilder.setDefaultCredentialsProvider(credentialsProvider);
    }
}

SSLContextParameters params = new SSLContextParameters();
params.setProvider("JTLS");
params.setSecureSocketProtocol("GostTLS");

KeyStoreParameters trustKeyStoreParameters = new KeyStoreParameters();
trustKeyStoreParameters.setProvider("JCP");
trustKeyStoreParameters.setType("CertStore");
trustKeyStoreParameters.setResource("jcp-trust-store"); // файл хранилища из ControlPanel
trustKeyStoreParameters.setPassword(password);

TrustManagersParameters trustManagers = new TrustManagersParameters();
trustManagers.setAlgorithm("GostX509");
trustManagers.setProvider("JTLS");
trustManagers.setKeyStore(trustKeyStoreParameters);

params.setTrustManagers(trustManagers);

SSLContext sslContext = params.createSSLContext();
SSLSocketFactory socketFactory = sslContext.getSocketFactory();