package io.undertow.examples.reverseproxy;
import io.undertow.Undertow;
import io.undertow.examples.UndertowExample;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.ResponseCodeHandler;
import io.undertow.server.handlers.proxy.LoadBalancingProxyClient;
import io.undertow.server.handlers.proxy.ProxyHandler;
import io.undertow.util.Headers;
import java.net.URI;
import java.net.URISyntaxException;
/**
* @author Stuart Douglas
*/
@UndertowExample("Reverse Proxy")
public class ReverseProxyServer {
public static void main(final String[] args) {
try {
final Undertow server1 = Undertow.builder()
.addListener(8081, "localhost")
.setHandler(new HttpHandler() {
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
exchange.getResponseSender().send("Server1");
}
})
.build();
server1.start();
final Undertow server2 = Undertow.builder()
.addListener(8082, "localhost")
.setHandler(new HttpHandler() {
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
exchange.getResponseSender().send("Server2");
}
})
.build();
server2.start();
final Undertow server3 = Undertow.builder()
.addListener(8083, "localhost")
.setHandler(new HttpHandler() {
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
exchange.getResponseSender().send("Server3");
}
})
.build();
server3.start();
LoadBalancingProxyClient loadBalancer = new LoadBalancingProxyClient()
.addHost(new URI("http://localhost:8081"))
.addHost(new URI("http://localhost:8082"))
.addHost(new URI("http://localhost:8083"))
.setConnectionsPerThread(20);
Undertow reverseProxy = Undertow.builder()
.addListener(8080, "localhost")
.setIoThreads(4)
.setHandler(new ProxyHandler(loadBalancer, 30000, ResponseCodeHandler.HANDLE_404))
.build();
reverseProxy.start();
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
}
}