HTTP Client

import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client = HttpClient.create();  (1)

		client.get()                       (2)
		      .uri("https://example.com/") (3)
		      .response()                  (4)
		      .block();
	}
}

import io.netty.buffer.Unpooled;
import io.netty.util.CharsetUtil;
import reactor.core.publisher.Flux;
import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client = HttpClient.create();

		client.websocket()
		      .uri("wss://echo.websocket.org")
		      .handle((inbound, outbound) -> {
		          inbound.receive()
		                 .asString()
		                 .take(1)
		                 .subscribe(System.out::println);

		          final byte[] msgBytes = "hello".getBytes(CharsetUtil.ISO_8859_1);
		          return outbound.send(Flux.just(Unpooled.wrappedBuffer(msgBytes), Unpooled.wrappedBuffer(msgBytes)))
		                         .neverComplete();
		      })
		      .blockLast();
	}
}

import reactor.core.publisher.Mono;
import reactor.netty.ByteBufFlux;
import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client = HttpClient.create();

		client.warmup() (1)
		      .block();

		client.post()
		      .uri("https://example.com/")
		      .send(ByteBufFlux.fromString(Mono.just("hello")))
		      .response()
		      .block(); (2)
	}
}

import reactor.core.publisher.Mono;
import reactor.netty.ByteBufFlux;
import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client = HttpClient.create();

		client.post()
		      .uri("https://example.com/")
		      .send(ByteBufFlux.fromString(Mono.just("hello"))) (1)
		      .response()
		      .block();
	}
}

import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client = HttpClient.create();

		client.get()
		      .uri("https://example.com/")
		      .responseContent() (1)
		      .aggregate()       (2)
		      .asString()        (3)
		      .block();
	}
}

import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.ReadTimeoutHandler;
import reactor.netty.http.client.HttpClient;
import java.util.concurrent.TimeUnit;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .doOnConnected(conn ->
				              conn.addHandlerFirst(new ReadTimeoutHandler(10, TimeUnit.SECONDS)))   (1)
				          .doOnChannelInit((observer, channel, remoteAddress) ->
				              channel.pipeline()
				                     .addFirst(new LoggingHandler("reactor.netty.examples")));      (2)

		client.get()
		      .uri("https://example.com/")
		      .response()
		      .block();
	}
}

import io.netty.channel.ChannelOption;
import io.netty.channel.epoll.EpollChannelOption;
//import io.netty.channel.socket.nio.NioChannelOption;
//import jdk.net.ExtendedSocketOptions;
import reactor.netty.http.client.HttpClient;
import java.net.InetSocketAddress;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .bindAddress(() -> new InetSocketAddress("host", 1234))
				          .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000) (1)
				          .option(ChannelOption.SO_KEEPALIVE, true)            (2)
				          // The options below are available only when NIO transport (Java 11) is used
				          // on Mac or Linux (Java does not currently support these extended options on Windows)
				          // https://bugs.openjdk.java.net/browse/JDK-8194298
				          //.option(NioChannelOption.of(ExtendedSocketOptions.TCP_KEEPIDLE), 300)
				          //.option(NioChannelOption.of(ExtendedSocketOptions.TCP_KEEPINTERVAL), 60)
				          //.option(NioChannelOption.of(ExtendedSocketOptions.TCP_KEEPCOUNT), 8);
				          // The options below are available only when Epoll transport is used
				          .option(EpollChannelOption.TCP_KEEPIDLE, 300)        (3)
				          .option(EpollChannelOption.TCP_KEEPINTVL, 60)        (4)
				          .option(EpollChannelOption.TCP_KEEPCNT, 8);          (5)

		String response =
				client.get()
				      .uri("https://example.com/")
				      .responseContent()
				      .aggregate()
				      .asString()
				      .block();

		System.out.println("Response " + response);
	}
}

	/**
	 * Default max connections. Fallback to
	 * 2 * available number of processors (but with a minimum value of 16)
	 */
	public static final String POOL_MAX_CONNECTIONS = "reactor.netty.pool.maxConnections";
	/**
	 * Default acquisition timeout (milliseconds) before error. If -1 will never wait to
	 * acquire before opening a new
	 * connection in an unbounded fashion. Fallback 45 seconds
	 */
	public static final String POOL_ACQUIRE_TIMEOUT = "reactor.netty.pool.acquireTimeout";
	/**
	 * Default max idle time, fallback - max idle time is not specified.
	 * <p><strong>Note:</strong> This configuration is not applicable for {@link reactor.netty.tcp.TcpClient}.
	 * A TCP connection is always closed and never returned to the pool.
	 */
	public static final String POOL_MAX_IDLE_TIME = "reactor.netty.pool.maxIdleTime";
	/**
	 * Default max life time, fallback - max life time is not specified.
	 * <p><strong>Note:</strong> This configuration is not applicable for {@link reactor.netty.tcp.TcpClient}.
	 * A TCP connection is always closed and never returned to the pool.
	 */
	public static final String POOL_MAX_LIFE_TIME = "reactor.netty.pool.maxLifeTime";
	/**
	 * Default leasing strategy (fifo, lifo), fallback to fifo.
	 * <ul>
	 *     <li>fifo - The connection selection is first in, first out</li>
	 *     <li>lifo - The connection selection is last in, first out</li>
	 * </ul>
	 * <p><strong>Note:</strong> This configuration is not applicable for {@link reactor.netty.tcp.TcpClient}.
	 * A TCP connection is always closed and never returned to the pool.
	 */
	public static final String POOL_LEASING_STRATEGY = "reactor.netty.pool.leasingStrategy";
	/**
	 * Default {@code getPermitsSamplingRate} (between 0d and 1d (percentage))
	 * to be used with a {@link SamplingAllocationStrategy}.
	 * This strategy wraps a {@link PoolBuilder#sizeBetween(int, int) sizeBetween} {@link AllocationStrategy}
	 * and samples calls to {@link AllocationStrategy#getPermits(int)}.
	 * Fallback - sampling is not enabled.
	 */
	public static final String POOL_GET_PERMITS_SAMPLING_RATE = "reactor.netty.pool.getPermitsSamplingRate";
	/**
	 * Default {@code returnPermitsSamplingRate} (between 0d and 1d (percentage))
	 * to be used with a {@link SamplingAllocationStrategy}.
	 * This strategy wraps a {@link PoolBuilder#sizeBetween(int, int) sizeBetween} {@link AllocationStrategy}
	 * and samples calls to {@link AllocationStrategy#returnPermits(int)}.
	 * Fallback - sampling is not enabled.
	 */
	public static final String POOL_RETURN_PERMITS_SAMPLING_RATE = "reactor.netty.pool.returnPermitsSamplingRate";

import reactor.netty.http.client.HttpClient;
import reactor.netty.resources.ConnectionProvider;

import java.time.Duration;

public class Application {

	public static void main(String[] args) {
		ConnectionProvider provider =
				ConnectionProvider.builder("custom")
				                  .maxConnections(50)
				                  .maxIdleTime(Duration.ofSeconds(20))           (1)
				                  .maxLifeTime(Duration.ofSeconds(60))           (2)
				                  .pendingAcquireTimeout(Duration.ofSeconds(60)) (3)
				                  .evictInBackground(Duration.ofSeconds(120))    (4)
				                  .build();

		HttpClient client = HttpClient.create(provider);

		String response =
				client.get()
				      .uri("https://example.com/")
				      .responseContent()
				      .aggregate()
				      .asString()
				      .block();

		System.out.println("Response " + response);

		provider.disposeLater()
		        .block();
	}
}

import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.newConnection()
				          .doOnConnected(conn -> System.out.println("Connection " + conn.channel()));

		String response =
				// A new connection is established for every request
				client.get()
				      .uri("https://httpbin.org/get")
				      .responseContent()
				      .aggregate()
				      .asString()
				      .block();

		System.out.println("Response " + response);

		response =
				// A new connection is established for every request
				client.post()
				      .uri("https://httpbin.org/post")
				      .responseContent()
				      .aggregate()
				      .asString()
				      .block();

		System.out.println("Response " + response);
	}
}

import reactor.netty.http.Http11SslContextSpec;
import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		Http11SslContextSpec http11SslContextSpec = Http11SslContextSpec.forClient();

		HttpClient client =
				HttpClient.create()
				          .secure(spec -> spec.sslContext(http11SslContextSpec));

		client.get()
		      .uri("https://example.com/")
		      .response()
		      .block();
	}
}

import io.netty.handler.codec.http.HttpHeaders;
import reactor.core.publisher.Mono;
import reactor.netty.http.HttpProtocol;
import reactor.netty.http.client.HttpClient;
import reactor.util.function.Tuple2;

public class H2Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .protocol(HttpProtocol.H2) (1)
				          .secure();                 (2)

		Tuple2<String, HttpHeaders> response =
				client.get()
				      .uri("https://example.com/")
				      .responseSingle((res, bytes) -> bytes.asString()
				                                           .zipWith(Mono.just(res.responseHeaders())))
				      .block();

		System.out.println("Used stream ID: " + response.getT2().get("x-http2-stream-id"));
		System.out.println("Response: " + response.getT1());
	}
}

import io.netty.handler.codec.http.HttpHeaders;
import reactor.core.publisher.Mono;
import reactor.netty.http.HttpProtocol;
import reactor.netty.http.client.HttpClient;
import reactor.util.function.Tuple2;

public class H2CApplication {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .protocol(HttpProtocol.H2C);

		Tuple2<String, HttpHeaders> response =
				client.get()
				      .uri("http://localhost:8080/")
				      .responseSingle((res, bytes) -> bytes.asString()
				                                           .zipWith(Mono.just(res.responseHeaders())))
				      .block();

		System.out.println("Used stream ID: " + response.getT2().get("x-http2-stream-id"));
		System.out.println("Response: " + response.getT1());
	}
}

import io.netty.handler.codec.http.HttpHeaders;
import reactor.core.publisher.Mono;
import reactor.netty.http.HttpProtocol;
import reactor.netty.http.client.HttpClient;
import reactor.util.function.Tuple2;

import java.net.InetSocketAddress;
import java.time.Duration;

public class Application {

	public static void main(String[] args) throws Exception {
		HttpClient client =
				HttpClient.create()
				          .remoteAddress(() -> new InetSocketAddress("www.google.com", 443))
				          .protocol(HttpProtocol.HTTP3)                                  (1)
				          .secure()                                                      (2)
				          .http3Settings(spec -> spec.idleTimeout(Duration.ofSeconds(5)) (3)
				                                     .maxData(10000000)
				                                     .maxStreamDataBidirectionalLocal(1000000));

		Tuple2<String, HttpHeaders> response =
				client.get()
				      .uri("/")
				      .responseSingle((res, bytes) -> bytes.asString()
				                                           .zipWith(Mono.just(res.responseHeaders())))
				      .block();

		System.out.println("Used stream ID: " + response.getT2().get("x-http3-stream-id"));
		System.out.println("Response: " + response.getT1());
	}
}

import reactor.netty.http.client.HttpClient;
import reactor.netty.transport.ProxyProvider;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .proxy(spec -> spec.type(ProxyProvider.Proxy.HTTP)
				                             .host("proxy")
				                             .port(8080)
				                             .nonProxyHosts("localhost")
				                             .connectTimeoutMillis(20_000)); (1)

		String response =
				client.get()
				      .uri("https://example.com/")
				      .responseContent()
				      .aggregate()
				      .asString()
				      .block();

		System.out.println("Response " + response);
	}
}

import io.micrometer.core.instrument.Metrics;
import io.micrometer.core.instrument.config.MeterFilter;
import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		Metrics.globalRegistry (1)
		       .config()
		       .meterFilter(MeterFilter.maximumAllowableTags("reactor.netty.http.client", "URI", 100, MeterFilter.deny()));

		HttpClient client =
				HttpClient.create()
				          .metrics(true, s -> {
				              if (s.startsWith("/stream/")) { (2)
				                  return "/stream/{n}";
				              }
				              else if (s.startsWith("/bytes/")) {
				                  return "/bytes/{n}";
				              }
				              return s;
				          }); (3)

		client.get()
		      .uri("https://httpbin.org/stream/2")
		      .responseContent()
		      .blockLast();

		client.get()
		      .uri("https://httpbin.org/bytes/1024")
		      .responseContent()
		      .blockLast();
	}
}

import reactor.netty.http.client.HttpClient;
import reactor.netty.http.client.HttpClientMetricsRecorder;

import java.net.SocketAddress;
import java.time.Duration;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .metrics(true, CustomHttpClientMetricsRecorder::new); (1)

		client.get()
		      .uri("https://httpbin.org/stream/2")
		      .response()
		      .block();
	}

import brave.Tracing;
import brave.propagation.StrictCurrentTraceContext;
import brave.sampler.Sampler;
import io.micrometer.tracing.CurrentTraceContext;
import io.micrometer.tracing.Tracer;
import io.micrometer.tracing.brave.bridge.BraveBaggageManager;
import io.micrometer.tracing.brave.bridge.BraveCurrentTraceContext;
import io.micrometer.tracing.brave.bridge.BravePropagator;
import io.micrometer.tracing.brave.bridge.BraveTracer;
import io.micrometer.tracing.propagation.Propagator;
import reactor.netty.http.client.HttpClient;
import reactor.netty.http.observability.ReactorNettyPropagatingSenderTracingObservationHandler;
import reactor.netty.observability.ReactorNettyTracingObservationHandler;
import zipkin2.reporter.brave.AsyncZipkinSpanHandler;
import zipkin2.reporter.urlconnection.URLConnectionSender;

import static reactor.netty.Metrics.OBSERVATION_REGISTRY;

public class Application {

	public static void main(String[] args) {
		init(); (1)

		HttpClient client =
				HttpClient.create()
				          .metrics(true, s -> {
				              if (s.startsWith("/stream/")) { (2)
				                  return "/stream/{n}";
				              }
				              return s;
				          }); (3)

		client.get()
		      .uri("https://httpbin.org/stream/3")
		      .responseContent()
		      .blockLast();
	}

	/**
	 * This setup is based on
	 * <a href="https://micrometer.io/docs/tracing#_micrometer_tracing_brave_setup">Micrometer Tracing Brave Setup</a>.
	 */
	static void init() {
		AsyncZipkinSpanHandler spanHandler = AsyncZipkinSpanHandler
				.create(URLConnectionSender.create("http://localhost:9411/api/v2/spans"));

		StrictCurrentTraceContext braveCurrentTraceContext = StrictCurrentTraceContext.create();

		CurrentTraceContext bridgeContext = new BraveCurrentTraceContext(braveCurrentTraceContext);

		Tracing tracing =
				Tracing.newBuilder()
				       .currentTraceContext(braveCurrentTraceContext)
				       .supportsJoin(false)
				       .traceId128Bit(true)
				       .sampler(Sampler.ALWAYS_SAMPLE)
				       .addSpanHandler(spanHandler)
				       .localServiceName("reactor-netty-examples")
				       .build();

		brave.Tracer braveTracer = tracing.tracer();

		Tracer tracer = new BraveTracer(braveTracer, bridgeContext, new BraveBaggageManager());

		Propagator propagator = new BravePropagator(tracing);

		OBSERVATION_REGISTRY.observationConfig()
		                    .observationHandler(new ReactorNettyPropagatingSenderTracingObservationHandler(tracer, propagator))
		                    .observationHandler(new ReactorNettyTracingObservationHandler(tracer));
	}
}

import io.netty.channel.unix.DomainSocketAddress;
import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .remoteAddress(() -> new DomainSocketAddress("/tmp/test.sock")); (1)

		client.get()
		      .uri("/")
		      .response()
		      .block();
	}
}

import reactor.netty.http.client.HttpClient;

import java.time.Duration;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .resolver(spec -> spec.queryTimeout(Duration.ofMillis(500))); (1)

		String response =
				client.get()
				      .uri("https://example.com/")
				      .responseContent()
				      .aggregate()
				      .asString()
				      .block();

		System.out.println("Response " + response);
	}
}

import io.netty.resolver.DefaultAddressResolverGroup;
import reactor.netty.http.client.HttpClient;

public class Application {

	public static void main(String[] args) {
		HttpClient client =
				HttpClient.create()
				          .resolver(DefaultAddressResolverGroup.INSTANCE); (1)

		String response =
				client.get()
				      .uri("https://example.com/")
				      .responseContent()
				      .aggregate()
				      .asString()
				      .block();

		System.out.println("Response " + response);
	}
}