Example usage for io.netty.handler.codec.http2 Http2SecurityUtil CIPHERS

List of usage examples for io.netty.handler.codec.http2 Http2SecurityUtil CIPHERS

Introduction

In this page you can find the example usage for io.netty.handler.codec.http2 Http2SecurityUtil CIPHERS.

Prototype

List CIPHERS

To view the source code for io.netty.handler.codec.http2 Http2SecurityUtil CIPHERS.

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Document

The following list is derived from <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/SunProviders.html">SunJSSE Supported Ciphers</a> and <a href="https://wiki.mozilla.org/Security/Server_Side_TLS#Modern_compatibility">Mozilla Modern Cipher Suites</a> in accordance with the <a href="https://tools.ietf.org/html/rfc7540#section-9.2.2">HTTP/2 Specification</a>.

Usage

From source file:com.flysoloing.learning.network.netty.http2.helloworld.client.Http2Client.java

License:Apache License

public static void main(String[] args) throws Exception {
    // Configure SSL.
    final SslContext sslCtx;
    if (SSL) {//from  w  w  w  .  j  ava2s . c  o  m
        SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
        sslCtx = SslContextBuilder.forClient().sslProvider(provider)
                /* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
                 * Please refer to the HTTP/2 specification for cipher requirements. */
                .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                .trustManager(InsecureTrustManagerFactory.INSTANCE)
                .applicationProtocolConfig(new ApplicationProtocolConfig(Protocol.ALPN,
                        // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                        SelectorFailureBehavior.NO_ADVERTISE,
                        // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                        SelectedListenerFailureBehavior.ACCEPT, ApplicationProtocolNames.HTTP_2,
                        ApplicationProtocolNames.HTTP_1_1))
                .build();
    } else {
        sslCtx = null;
    }

    EventLoopGroup workerGroup = new NioEventLoopGroup();
    Http2ClientInitializer initializer = new Http2ClientInitializer(sslCtx, Integer.MAX_VALUE);

    try {
        // Configure the client.
        Bootstrap b = new Bootstrap();
        b.group(workerGroup);
        b.channel(NioSocketChannel.class);
        b.option(ChannelOption.SO_KEEPALIVE, true);
        b.remoteAddress(HOST, PORT);
        b.handler(initializer);

        // Start the client.
        Channel channel = b.connect().syncUninterruptibly().channel();
        System.out.println("Connected to [" + HOST + ':' + PORT + ']');

        // Wait for the HTTP/2 upgrade to occur.
        Http2SettingsHandler http2SettingsHandler = initializer.settingsHandler();
        http2SettingsHandler.awaitSettings(5, TimeUnit.SECONDS);

        HttpResponseHandler responseHandler = initializer.responseHandler();
        int streamId = 3;
        HttpScheme scheme = SSL ? HttpScheme.HTTPS : HttpScheme.HTTP;
        AsciiString hostName = new AsciiString(HOST + ':' + PORT);
        System.err.println("Sending request(s)...");
        if (URL != null) {
            // Create a simple GET request.
            FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, GET, URL);
            request.headers().add(HttpHeaderNames.HOST, hostName);
            request.headers().add(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), scheme.name());
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
            responseHandler.put(streamId, channel.write(request), channel.newPromise());
            streamId += 2;
        }
        if (URL2 != null) {
            // Create a simple POST request with a body.
            FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, POST, URL2,
                    wrappedBuffer(URL2DATA.getBytes(CharsetUtil.UTF_8)));
            request.headers().add(HttpHeaderNames.HOST, hostName);
            request.headers().add(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), scheme.name());
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
            responseHandler.put(streamId, channel.write(request), channel.newPromise());
        }
        channel.flush();
        responseHandler.awaitResponses(5, TimeUnit.SECONDS);
        System.out.println("Finished HTTP/2 request(s)");

        // Wait until the connection is closed.
        channel.close().syncUninterruptibly();
    } finally {
        workerGroup.shutdownGracefully();
    }
}

From source file:com.flysoloing.learning.network.netty.http2.helloworld.multiplex.server.Http2Server.java

License:Apache License

public static void main(String[] args) throws Exception {
    // Configure SSL.
    final SslContext sslCtx;
    if (SSL) {/*from www  .ja  va2 s .  c  o m*/
        SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
        SelfSignedCertificate ssc = new SelfSignedCertificate();
        sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).sslProvider(provider)
                /* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
                 * Please refer to the HTTP/2 specification for cipher requirements. */
                .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                .applicationProtocolConfig(new ApplicationProtocolConfig(Protocol.ALPN,
                        // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                        SelectorFailureBehavior.NO_ADVERTISE,
                        // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                        SelectedListenerFailureBehavior.ACCEPT, ApplicationProtocolNames.HTTP_2,
                        ApplicationProtocolNames.HTTP_1_1))
                .build();
    } else {
        sslCtx = null;
    }
    // Configure the server.
    EventLoopGroup group = new NioEventLoopGroup();
    try {
        ServerBootstrap b = new ServerBootstrap();
        b.option(ChannelOption.SO_BACKLOG, 1024);
        b.group(group).channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.INFO))
                .childHandler(new Http2ServerInitializer(sslCtx));

        Channel ch = b.bind(PORT).sync().channel();

        System.err.println("Open your HTTP/2-enabled web browser and navigate to " + (SSL ? "https" : "http")
                + "://127.0.0.1:" + PORT + '/');

        ch.closeFuture().sync();
    } finally {
        group.shutdownGracefully();
    }
}

From source file:com.hop.hhxx.example.http2.helloworld.client.Http2Client.java

License:Apache License

public static void main(String[] args) throws Exception {
    // Configure SSL.
    final SslContext sslCtx;
    if (SSL) {//  ww w.j  ava2  s .  c o m
        SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
        sslCtx = SslContextBuilder.forClient().sslProvider(provider)
                /* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
                 * Please refer to the HTTP/2 specification for cipher requirements. */
                .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                .trustManager(InsecureTrustManagerFactory.INSTANCE)
                .applicationProtocolConfig(new ApplicationProtocolConfig(Protocol.ALPN,
                        // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                        SelectorFailureBehavior.NO_ADVERTISE,
                        // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                        SelectedListenerFailureBehavior.ACCEPT, ApplicationProtocolNames.HTTP_2,
                        ApplicationProtocolNames.HTTP_1_1))
                .build();
    } else {
        sslCtx = null;
    }

    EventLoopGroup workerGroup = new NioEventLoopGroup();
    Http2ClientInitializer initializer = new Http2ClientInitializer(sslCtx, Integer.MAX_VALUE);

    try {
        // Configure the client.
        Bootstrap b = new Bootstrap();
        b.group(workerGroup);
        b.channel(NioSocketChannel.class);
        b.option(ChannelOption.SO_KEEPALIVE, true);
        b.remoteAddress(HOST, PORT);
        b.handler(initializer);

        // Start the client.
        Channel channel = b.connect().syncUninterruptibly().channel();
        System.out.println("Connected to [" + HOST + ':' + PORT + ']');

        // Wait for the HTTP/2 upgrade to occur.
        Http2SettingsHandler http2SettingsHandler = initializer.settingsHandler();
        http2SettingsHandler.awaitSettings(5, TimeUnit.SECONDS);

        HttpResponseHandler responseHandler = initializer.responseHandler();
        int streamId = 3;
        HttpScheme scheme = SSL ? HttpScheme.HTTPS : HttpScheme.HTTP;
        AsciiString hostName = new AsciiString(HOST + ':' + PORT);
        System.err.println("Sending request(s)...");
        if (URL != null) {
            // Create a simple GET request.
            FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, GET, URL);
            request.headers().add(HttpHeaderNames.HOST, hostName);
            request.headers().add(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), scheme.name());
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
            responseHandler.put(streamId, channel.writeAndFlush(request), channel.newPromise());
            streamId += 2;
        }
        if (URL2 != null) {
            // Create a simple POST request with a body.
            FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, POST, URL2,
                    Unpooled.copiedBuffer(URL2DATA.getBytes(CharsetUtil.UTF_8)));
            request.headers().add(HttpHeaderNames.HOST, hostName);
            request.headers().add(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), scheme.name());
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
            request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
            responseHandler.put(streamId, channel.writeAndFlush(request), channel.newPromise());
            streamId += 2;
        }
        responseHandler.awaitResponses(5, TimeUnit.SECONDS);
        System.out.println("Finished HTTP/2 request(s)");

        // Wait until the connection is closed.
        channel.close().syncUninterruptibly();
    } finally {
        workerGroup.shutdownGracefully();
    }
}

From source file:com.linecorp.armeria.client.http.HttpClientPipelineConfigurator.java

License:Apache License

HttpClientPipelineConfigurator(SessionProtocol sessionProtocol, SessionOptions options) {
    switch (sessionProtocol) {
    case HTTP://from  w w w  .jav a  2  s .  co  m
    case HTTPS:
        httpPreference = HttpPreference.HTTP2_PREFERRED;
        break;
    case H1:
    case H1C:
        httpPreference = HttpPreference.HTTP1_REQUIRED;
        break;
    case H2:
    case H2C:
        httpPreference = HttpPreference.HTTP2_REQUIRED;
        break;
    default:
        // Should never reach here.
        throw new Error();
    }

    this.options = requireNonNull(options, "options");

    if (sessionProtocol.isTls()) {
        try {
            final SslContextBuilder builder = SslContextBuilder.forClient();

            builder.sslProvider(NativeLibraries.isOpenSslAvailable() ? SslProvider.OPENSSL : SslProvider.JDK);
            options.trustManagerFactory().ifPresent(builder::trustManager);

            if (httpPreference == HttpPreference.HTTP2_REQUIRED
                    || httpPreference == HttpPreference.HTTP2_PREFERRED) {

                builder.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                        .applicationProtocolConfig(
                                new ApplicationProtocolConfig(ApplicationProtocolConfig.Protocol.ALPN,
                                        // NO_ADVERTISE is currently the only mode supported by both OpenSsl and
                                        // JDK providers.
                                        ApplicationProtocolConfig.SelectorFailureBehavior.NO_ADVERTISE,
                                        // ACCEPT is currently the only mode supported by both OpenSsl and JDK
                                        // providers.
                                        ApplicationProtocolConfig.SelectedListenerFailureBehavior.ACCEPT,
                                        ApplicationProtocolNames.HTTP_2));
            }
            sslCtx = builder.build();
        } catch (SSLException e) {
            throw new IllegalStateException("failed to create an SslContext", e);
        }
    } else {
        sslCtx = null;
    }
}

From source file:com.linecorp.armeria.client.HttpClientPipelineConfigurator.java

License:Apache License

HttpClientPipelineConfigurator(HttpClientFactory clientFactory, SessionProtocol sessionProtocol) {
    this.clientFactory = clientFactory;

    if (sessionProtocol == HTTP || sessionProtocol == HTTPS) {
        httpPreference = HttpPreference.HTTP2_PREFERRED;
    } else if (sessionProtocol == H1 || sessionProtocol == H1C) {
        httpPreference = HttpPreference.HTTP1_REQUIRED;
    } else if (sessionProtocol == H2 || sessionProtocol == H2C) {
        httpPreference = HttpPreference.HTTP2_REQUIRED;
    } else {//from   ww w .j  ava2 s . c  o  m
        // Should never reach here.
        throw new Error();
    }

    if (sessionProtocol.isTls()) {
        try {
            final SslContextBuilder builder = SslContextBuilder.forClient();

            builder.sslProvider(Flags.useOpenSsl() ? SslProvider.OPENSSL : SslProvider.JDK);
            clientFactory.sslContextCustomizer().accept(builder);

            if (httpPreference == HttpPreference.HTTP2_REQUIRED
                    || httpPreference == HttpPreference.HTTP2_PREFERRED) {

                builder.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                        .applicationProtocolConfig(
                                new ApplicationProtocolConfig(ApplicationProtocolConfig.Protocol.ALPN,
                                        // NO_ADVERTISE is currently the only mode supported by both OpenSsl and
                                        // JDK providers.
                                        ApplicationProtocolConfig.SelectorFailureBehavior.NO_ADVERTISE,
                                        // ACCEPT is currently the only mode supported by both OpenSsl and JDK
                                        // providers.
                                        ApplicationProtocolConfig.SelectedListenerFailureBehavior.ACCEPT,
                                        ApplicationProtocolNames.HTTP_2));
            }
            sslCtx = builder.build();
        } catch (SSLException e) {
            throw new IllegalStateException("failed to create an SslContext", e);
        }
    } else {
        sslCtx = null;
    }
}

From source file:com.linecorp.armeria.client.HttpConfigurator.java

License:Apache License

HttpConfigurator(SessionProtocol sessionProtocol, RemoteInvokerOptions options) {
    switch (sessionProtocol) {
    case HTTP:/* w ww  .  j  av  a  2 s.  c om*/
    case HTTPS:
        httpPreference = HttpPreference.HTTP2_PREFERRED;
        break;
    case H1:
    case H1C:
        httpPreference = HttpPreference.HTTP1_REQUIRED;
        break;
    case H2:
    case H2C:
        httpPreference = HttpPreference.HTTP2_REQUIRED;
        break;
    default:
        // Should never reach here.
        throw new Error();
    }

    this.options = requireNonNull(options, "options");

    if (sessionProtocol.isTls()) {
        try {
            final SslContextBuilder builder = SslContextBuilder.forClient();

            builder.sslProvider(NativeLibraries.isOpenSslAvailable() ? SslProvider.OPENSSL : SslProvider.JDK);
            options.trustManagerFactory().ifPresent(builder::trustManager);

            if (httpPreference == HttpPreference.HTTP2_REQUIRED
                    || httpPreference == HttpPreference.HTTP2_PREFERRED) {

                builder.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                        .applicationProtocolConfig(
                                new ApplicationProtocolConfig(ApplicationProtocolConfig.Protocol.ALPN,
                                        // NO_ADVERTISE is currently the only mode supported by both OpenSsl and
                                        // JDK providers.
                                        ApplicationProtocolConfig.SelectorFailureBehavior.NO_ADVERTISE,
                                        // ACCEPT is currently the only mode supported by both OpenSsl and JDK
                                        // providers.
                                        ApplicationProtocolConfig.SelectedListenerFailureBehavior.ACCEPT,
                                        ApplicationProtocolNames.HTTP_2));
            }
            sslCtx = builder.build();
        } catch (SSLException e) {
            throw new IllegalStateException("failed to create a SslContext", e);
        }
    } else {
        sslCtx = null;
    }
}

From source file:com.linecorp.armeria.server.AbstractVirtualHostBuilder.java

License:Apache License

/**
 * Configures SSL or TLS of this {@link VirtualHost} with the specified {@code keyCertChainFile},
 * {@code keyFile} and {@code keyPassword}.
 *//*w w w .jav  a 2s . co m*/
public B tls(File keyCertChainFile, File keyFile, @Nullable String keyPassword) throws SSLException {
    if (!keyCertChainFile.exists()) {
        throw new SSLException("non-existent certificate chain file: " + keyCertChainFile);
    }
    if (!keyCertChainFile.canRead()) {
        throw new SSLException("cannot read certificate chain file: " + keyCertChainFile);
    }
    if (!keyFile.exists()) {
        throw new SSLException("non-existent key file: " + keyFile);
    }
    if (!keyFile.canRead()) {
        throw new SSLException("cannot read key file: " + keyFile);
    }

    final SslContext sslCtx;

    try {
        sslCtx = BouncyCastleKeyFactoryProvider.call(() -> {
            final SslContextBuilder builder = SslContextBuilder.forServer(keyCertChainFile, keyFile,
                    keyPassword);

            builder.sslProvider(Flags.useOpenSsl() ? SslProvider.OPENSSL : SslProvider.JDK);
            builder.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE);
            builder.applicationProtocolConfig(HTTPS_ALPN_CFG);

            return builder.build();
        });
    } catch (RuntimeException | SSLException e) {
        throw e;
    } catch (Exception e) {
        throw new SSLException("failed to configure TLS: " + e, e);
    }

    tls(sslCtx);
    return self();
}

From source file:com.linecorp.armeria.server.thrift.THttp2Client.java

License:Apache License

THttp2Client(String uriStr) throws TTransportException {
    uri = URI.create(uriStr);/*from  w w w  . j  av a  2s  .c  om*/

    int port;
    switch (uri.getScheme()) {
    case "http":
        port = uri.getPort();
        if (port < 0) {
            port = 80;
        }
        sslCtx = null;
        break;
    case "https":
        port = uri.getPort();
        if (port < 0) {
            port = 443;
        }

        try {
            sslCtx = SslContextBuilder.forClient()
                    .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                    .trustManager(InsecureTrustManagerFactory.INSTANCE)
                    .applicationProtocolConfig(new ApplicationProtocolConfig(Protocol.ALPN,
                            // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                            SelectorFailureBehavior.NO_ADVERTISE,
                            // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                            SelectedListenerFailureBehavior.ACCEPT, ApplicationProtocolNames.HTTP_2))
                    .build();
        } catch (SSLException e) {
            throw new TTransportException(TTransportException.UNKNOWN, e);
        }
        break;
    default:
        throw new IllegalArgumentException("unknown scheme: " + uri.getScheme());
    }

    String host = uri.getHost();
    if (host == null) {
        throw new IllegalArgumentException("host not specified: " + uriStr);
    }

    String path = uri.getPath();
    if (path == null) {
        throw new IllegalArgumentException("path not specified: " + uriStr);
    }

    this.host = host;
    this.port = port;
    this.path = path;
}

From source file:com.linecorp.armeria.server.VirtualHostBuilder.java

License:Apache License

/**
 * Sets the {@link SslContext} of this {@link VirtualHost} from the specified {@link SessionProtocol},
 * {@code keyCertChainFile}, {@code keyFile} and {@code keyPassword}.
 *//*w w w . j  a  v  a 2s.c o  m*/
public VirtualHostBuilder sslContext(SessionProtocol protocol, File keyCertChainFile, File keyFile,
        String keyPassword) throws SSLException {

    if (requireNonNull(protocol, "protocol") != SessionProtocol.HTTPS) {
        throw new IllegalArgumentException("unsupported protocol: " + protocol);
    }

    final SslContextBuilder builder = SslContextBuilder.forServer(keyCertChainFile, keyFile, keyPassword);

    builder.sslProvider(NativeLibraries.isOpenSslAvailable() ? SslProvider.OPENSSL : SslProvider.JDK);
    builder.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE);
    builder.applicationProtocolConfig(HTTPS_ALPN_CFG);

    sslContext(builder.build());

    return this;
}

From source file:com.relayrides.pushy.apns.ApnsClientBuilder.java

License:Open Source License

/**
 * Constructs a new {@link ApnsClient} with the previously-set configuration.
 *
 * @return a new ApnsClient instance with the previously-set configuration
 *
 * @throws SSLException if an SSL context could not be created for the new client for any reason
 *
 * @since 0.8//w w w .  j a v a  2 s .  c  o  m
 */
public ApnsClient build() throws SSLException {
    final SslContext sslContext;
    {
        final SslProvider sslProvider;

        if (this.preferredSslProvider != null) {
            sslProvider = this.preferredSslProvider;
        } else {
            if (OpenSsl.isAvailable()) {
                if (OpenSsl.isAlpnSupported()) {
                    log.info("Native SSL provider is available and supports ALPN; will use native provider.");
                    sslProvider = SslProvider.OPENSSL;
                } else {
                    log.info(
                            "Native SSL provider is available, but does not support ALPN; will use JDK SSL provider.");
                    sslProvider = SslProvider.JDK;
                }
            } else {
                log.info("Native SSL provider not available; will use JDK SSL provider.");
                sslProvider = SslProvider.JDK;
            }
        }

        final SslContextBuilder sslContextBuilder = SslContextBuilder.forClient().sslProvider(sslProvider)
                .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                .applicationProtocolConfig(
                        new ApplicationProtocolConfig(Protocol.ALPN, SelectorFailureBehavior.NO_ADVERTISE,
                                SelectedListenerFailureBehavior.ACCEPT, ApplicationProtocolNames.HTTP_2));

        if (this.trustedServerCertificatePemFile != null) {
            sslContextBuilder.trustManager(this.trustedServerCertificatePemFile);
        } else if (this.trustedServerCertificateInputStream != null) {
            sslContextBuilder.trustManager(this.trustedServerCertificateInputStream);
        } else if (this.trustedServerCertificates != null) {
            sslContextBuilder.trustManager(this.trustedServerCertificates);
        }

        sslContext = sslContextBuilder.build();
    }

    final ApnsClient apnsClient = new ApnsClient(sslContext, this.eventLoopGroup);

    apnsClient.setMetricsListener(this.metricsListener);
    apnsClient.setProxyHandlerFactory(this.proxyHandlerFactory);

    if (this.connectionTimeout != null) {
        apnsClient.setConnectionTimeout((int) this.connectionTimeoutUnit.toMillis(this.connectionTimeout));
    }

    if (this.writeTimeout != null) {
        apnsClient.setWriteTimeout(this.writeTimeoutUnit.toMillis(this.writeTimeout));
    }

    if (this.gracefulShutdownTimeout != null) {
        apnsClient.setGracefulShutdownTimeout(
                this.gracefulShutdownTimeoutUnit.toMillis(this.gracefulShutdownTimeout));
    }

    return apnsClient;
}