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Gateway.java

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package httpsrv;

import com.sun.net.httpserver.HttpServer;

import java.io.IOException;

import java.net.InetSocketAddress;

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.time.Duration;

import java.util.concurrent.Executors;

public class Gateway {

public static void main(String[] args) throws IOException {

if (args.length != 1) {

System.err.println("usage: gateway <target>");

System.exit(1);

}

var target = args[0];

var executor = Executors.newVirtualThreadPerTaskExecutor();

var client = HttpClient.newBuilder()

.executor(executor)

.connectTimeout(Duration.ofSeconds(5))

.build();

var request = HttpRequest.newBuilder()

.GET()

.uri(URI.create(target))

.build();

var server = HttpServer.create(new InetSocketAddress(8080), 0);

server.setExecutor(executor);

server.createContext("/").setHandler(exchange -> {

try {

var body = client.send(request, HttpResponse.BodyHandlers.ofByteArray()).body();

exchange.sendResponseHeaders(200, body.length);

try (var os = exchange.getResponseBody()) {

os.write(body);

}

} catch (InterruptedException e) {

throw new IOException(e);

}

});

server.start();

System.out.println("ready");

}

}