Http Server in CLIPS

Here’s the translation of the HTTP Server example from Go to Java, formatted in Markdown for Hugo:

Our HTTP server example demonstrates how to create a basic server using Java’s built-in com.sun.net.httpserver package.

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.util.Map;

public class HTTPServer {

    // A fundamental concept in HTTP servers is handlers. A handler is an object 
    // that processes HTTP requests. In Java, we can create handlers by implementing 
    // the HttpHandler interface.
    static class HelloHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            // The handle method is where we process the request and send the response.
            // Here, our simple response is just "hello\n".
            String response = "hello\n";
            exchange.sendResponseHeaders(200, response.length());
            try (OutputStream os = exchange.getResponseBody()) {
                os.write(response.getBytes());
            }
        }
    }

    static class HeadersHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            // This handler does something more sophisticated by reading all the 
            // HTTP request headers and echoing them into the response body.
            StringBuilder response = new StringBuilder();
            for (Map.Entry<String, java.util.List<String>> entry : exchange.getRequestHeaders().entrySet()) {
                for (String value : entry.getValue()) {
                    response.append(entry.getKey()).append(": ").append(value).append("\n");
                }
            }
            exchange.sendResponseHeaders(200, response.length());
            try (OutputStream os = exchange.getResponseBody()) {
                os.write(response.toString().getBytes());
            }
        }
    }

    public static void main(String[] args) throws IOException {
        // Create an HTTP server that listens on port 8090
        HttpServer server = HttpServer.create(new InetSocketAddress(8090), 0);

        // We register our handlers on server contexts using the createContext method.
        server.createContext("/hello", new HelloHandler());
        server.createContext("/headers", new HeadersHandler());

        // Start the server
        server.start();

        System.out.println("Server is listening on port 8090");
    }
}

To run the server:

$ javac HTTPServer.java
$ java HTTPServer &

Access the /hello route:

$ curl localhost:8090/hello
hello

This example demonstrates how to create a simple HTTP server in Java. It uses the com.sun.net.httpserver package, which provides a simple high-level HTTP server API.

The HelloHandler and HeadersHandler classes implement the HttpHandler interface, defining how to respond to requests on different routes. The main method creates the server, sets up the routes, and starts listening for incoming requests.

While the implementation details differ from the original example, the core concepts of handling HTTP requests and setting up routes remain the same.

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Http Server in CLIPS