CORS with Quarkus - Example

Hello everyone, today we will show you how to enable CORS support in the Quarkus application at the global level.

CORS Error in Web Apps:


Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources.

Let's learn how to enable cors in quarkus application,

Quarkus comes with a CORS filter that implements the javax.servlet.Filter interface and intercepts all incoming HTTP requests. It can be enabled in the Quarkus configuration file, 

application.properties:

quarkus.http.cors=true
quarkus.http.cors.origins=http://localhost
quarkus.http.cors.methods=GET,PUT,POST
quarkus.http.cors.headers=X-Custom
quarkus.http.cors.exposed-headers=Content-Disposition
quarkus.http.cors.access-control-max-age=24H
quarkus.http.cors.access-control-allow-credentials=true



UserResource:

package com.knf.dev.demo;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("/api/users")
public class UserResource {

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response hello() {
        return Response.ok("Congratulations! CORS enabled").
             build();
    }
}


Run:


Build application  jar file: mvn clean package



Start the application: java -jar quarkus-run.jar



Calling the REST endpoint:

<!DOCTYPE html>
<html>
<body>

<div id="demo">
<h1>CORS Demo</h1>
<button type="button" onclick="loadDoc()">
    Back End Call</button>
</div>

<script>
function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML =
      this.responseText;
    }
  };
  xhttp.open("GET", "http://localhost:8080/api/users/", true);
  xhttp.send();
}
</script>
</body>
</html>

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