Setting basic response http headers for REST resources on a simple Vertx Rest based app
I am new to Vert.x but as a Java developer (die hard) I find it much more enjoyable and promising comparing to NodeJS or whatever – Reactor based frameworks/libraries. So I was going through implementing a very simple Restful API, using Vert.x.
My problem for today is that I wanted to include some certain HttpHeaders in most (all) of my , responses. For example set the Content-type to “application/json”. In the future maybe add some others.
I was kind of wondering around as a Vert.x newbie, then I kind of realized that what is was eventually suggested in this blog post (See the use of BodyHandler) would actually work for me.
So I had my main VertxMain java app where I register my MyWebVerticleApp.
package com.javapapo.vertxweb;
import io.vertx.core.Vertx;
import io.vertx.core.VertxOptions;
/**
* Created by <a href="mailto:javapapo@mac.com">javapapo</a> on 15/11/15.
*/
public class VertxEngineMain {
public static void main(String[] args) {
VertxOptions opts = new VertxOptions();
Vertx vertx = Vertx.vertx(opts);
vertx.deployVerticle(new MyWebVerticleApp());
}
}Then I have created a small handler, I call it BaseResponseHandler, that eventually adds the HttpHeader in my responses.
package com.javapapo.vertxweb.handlers;
import io.netty.handler.codec.http.HttpResponse;
import io.vertx.core.Handler;
import io.vertx.core.http.HttpHeaders;
import io.vertx.core.http.HttpServerRequest;
import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.web.RoutingContext;
/**
* Created by <a href="mailto:javapapo@mac.com">javapapo</a> on 27/11/15.
*/
public class BaseResponseHandler implements Handler<RoutingContext>{
@Override
public void handle(RoutingContext context) {
HttpServerResponse response = context.response();
response.putHeader(HttpHeaders.CONTENT_TYPE.toString(), "application/json");
//other stuff!
response.setChunked(true);
context.next();
}
}Then in my MyWebVerticle I just register the handler to be invoked all the time, in the router chaining.
package com.javapapo.vertxweb;
import com.javapapo.vertxweb.handlers.BaseResponseHandler;
import com.javapapo.vertxweb.handlers.StatusHandler;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.Future;
import io.vertx.core.http.HttpServer;
import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.web.Route;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.handler.BodyHandler;
/**
* Created by <a href="mailto:javapapo@mac.com">javapapo</a> on 16/11/15.
*/
public class MyWebVerticleApp extends AbstractVerticle {
@Override
public void start(Future<Void> fut) {
HttpServer server = vertx.createHttpServer();
Router router = Router.router(vertx);
//enable the base response handler overall!
router.route().handler(new BaseResponseHandler());
router.route("/status/").handler(new StatusHandler());
server.requestHandler(router::accept).listen(8080);
}
}| Reference: | Setting basic response http headers for REST resources on a simple Vertx Rest based app from our JCG partner Paris Apostolopoulos at the Papo’s log blog. |
