Add Host property in HttpServerSupport

And change the defaults to:

* "0.0.0.0" for the host
* any available port, starting at 8080

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/boot/HttpServer.java

@@ -26,6 +26,8 @@ import org.springframework.http.server.reactive.HttpHandler;
  */
 public interface HttpServer extends InitializingBean, Lifecycle {
 
+	void setHost(String host);
+
 	void setPort(int port);
 
 	void setHandler(HttpHandler handler);

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/boot/HttpServerSupport.java

@@ -17,23 +17,37 @@
 package org.springframework.http.server.reactive.boot;
 
 
+import org.springframework.beans.factory.InitializingBean;
 import org.springframework.http.server.reactive.HttpHandler;
+import org.springframework.util.SocketUtils;
 
 /**
  * @author Rossen Stoyanchev
  */
 public class HttpServerSupport {
 
+	private String host = "0.0.0.0";
+
 	private int port = -1;
 
 	private HttpHandler httpHandler;
 
+	public void setHost(String host) {
+		this.host = host;
+	}
+
+	public String getHost() {
+		return host;
+	}
 
 	public void setPort(int port) {
 		this.port = port;
 	}
 
 	public int getPort() {
+		if(this.port == -1) {
+			this.port = SocketUtils.findAvailableTcpPort(8080);
+		}
 		return this.port;
 	}
 

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/boot/JettyHttpServer.java

@@ -24,7 +24,6 @@ import org.eclipse.jetty.servlet.ServletHolder;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.http.server.reactive.ServletHttpHandlerAdapter;
 import org.springframework.util.Assert;
-import org.springframework.util.SocketUtils;
 
 /**
  * @author Rossen Stoyanchev
@@ -44,10 +43,6 @@ public class JettyHttpServer extends HttpServerSupport implements InitializingBe
 	@Override
 	public void afterPropertiesSet() throws Exception {
 
-		if (getPort() == -1) {
-			setPort(SocketUtils.findAvailableTcpPort(8080));
-		}
-
 		this.jettyServer = new Server();
 
 		Assert.notNull(getHttpHandler());
@@ -59,6 +54,7 @@ public class JettyHttpServer extends HttpServerSupport implements InitializingBe
 		contextHandler.addServlet(servletHolder, "/");
 
 		ServerConnector connector = new ServerConnector(this.jettyServer);
+		connector.setHost(getHost());
 		connector.setPort(getPort());
 		this.jettyServer.addConnector(connector);
 	}

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/boot/ReactorHttpServer.java

@@ -39,9 +39,7 @@ public class ReactorHttpServer extends HttpServerSupport
 
 		Assert.notNull(getHttpHandler());
 		this.reactorHandler = new ReactorHttpHandlerAdapter(getHttpHandler());
-
-		this.reactorServer = (getPort() != -1 ? reactor.io.netty.http.HttpServer.create(getPort()) :
-				reactor.io.netty.http.HttpServer.create());
+		this.reactorServer = reactor.io.netty.http.HttpServer.create(getHost(), getPort());
 	}
 
 	@Override

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/boot/RxNettyHttpServer.java

@@ -16,6 +16,8 @@
 
 package org.springframework.http.server.reactive.boot;
 
+import java.net.InetSocketAddress;
+
 import io.netty.buffer.ByteBuf;
 
 import org.springframework.http.server.reactive.RxNettyHttpHandlerAdapter;
@@ -38,9 +40,8 @@ public class RxNettyHttpServer extends HttpServerSupport implements HttpServer {
 		Assert.notNull(getHttpHandler());
 		this.rxNettyHandler = new RxNettyHttpHandlerAdapter(getHttpHandler());
 
-		this.rxNettyServer = (getPort() != -1 ?
-				io.reactivex.netty.protocol.http.server.HttpServer.newServer(getPort()) :
-				io.reactivex.netty.protocol.http.server.HttpServer.newServer());
+		this.rxNettyServer = io.reactivex.netty.protocol.http.server.HttpServer
+				.newServer(new InetSocketAddress(getHost(), getPort()));
 	}
 
 

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/boot/TomcatHttpServer.java

@@ -20,6 +20,7 @@ import java.io.File;
 
 import org.apache.catalina.Context;
 import org.apache.catalina.LifecycleException;
+import org.apache.catalina.core.StandardHost;
 import org.apache.catalina.startup.Tomcat;
 
 import org.springframework.beans.factory.InitializingBean;
@@ -46,11 +47,8 @@ public class TomcatHttpServer extends HttpServerSupport implements InitializingB
 	@Override
 	public void afterPropertiesSet() throws Exception {
 
-		if (getPort() == -1) {
-			setPort(SocketUtils.findAvailableTcpPort(8080));
-		}
-
 		this.tomcatServer = new Tomcat();
+		this.tomcatServer.setHostname(getHost());
 		this.tomcatServer.setPort(getPort());
 
 		Assert.notNull(getHttpHandler());

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/boot/UndertowHttpServer.java

@@ -44,8 +44,7 @@ public class UndertowHttpServer extends HttpServerSupport implements HttpServer
 		Assert.notNull(getHttpHandler());
 		HttpHandler handler =
 				new UndertowHttpHandlerAdapter(getHttpHandler(), dataBufferFactory);
-		int port = (getPort() != -1 ? getPort() : 8080);
-		this.server = Undertow.builder().addHttpListener(port, "localhost")
+		this.server = Undertow.builder().addHttpListener(getPort(), getHost())
 				.setHandler(handler).build();
 	}