Start

package reproducer.apex.hashtag;

import io.vertx.core.Vertx;
import io.vertx.core.http.HttpMethod;
import io.vertx.core.http.HttpServer;
import io.vertx.core.http.HttpServerOptions;
import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.apex.core.Router;

import java.net.HttpURLConnection;

/**
 * <ol>
 * <li>Listen on GET request on port 99</li>
 * <li>Redirect client to localhost:8080/#/somepath/abcde</li>
 * <li>Test if apex route has been found</li>
 * </ol>
 */
public class Start {

	public static void main(String[] args) {
		Vertx vertx = Vertx.vertx();

		startServerOnPort99ToRedirectToPort8080(vertx);
		startServerOnPort8080(vertx);
	}

	private static void startServerOnPort99ToRedirectToPort8080(Vertx vertx) {
		HttpServerOptions options = new HttpServerOptions();
		options.setPort(99);
		HttpServer server = vertx.createHttpServer(options);

		Router router = Router.router(vertx);
		router.routeWithRegex(".*").handler(
				routingContext -> {
					HttpServerResponse response = routingContext.response();
					response.setStatusCode(HttpURLConnection.HTTP_MOVED_PERM);
					response.putHeader("Location",
							"http://localhost:8080/#/somepath/abcd");
					response.putHeader("Content-Length", String.valueOf(0));
					response.end();
				});
		server.requestHandler(router::accept).listen();
	}

	private static void startServerOnPort8080(Vertx vertx) {
		HttpServerOptions options = new HttpServerOptions();
		options.setPort(8080);
		HttpServer server = vertx.createHttpServer(options);

		Router router = Router.router(vertx);
		router.route().method(HttpMethod.GET).path("/#/somepath/:param1")
				.handler(routingContext -> {
					System.out.println(routingContext.request().path());
					System.out.println("Route found");

					routingContext.response().setStatusCode(200).end();

				});

		router.routeWithRegex(".*").handler(routingContext -> {
			System.out.println(routingContext.request().path());
			System.out.println("Route not found");

			routingContext.response().setStatusCode(404).end();
		});
		server.requestHandler(router::accept).listen();
	}

}

The output is:
"/
Route not found"

Everything works as expected because browsers do not transmit the #-part to the server.