Trouble-shooting CORS in Play Framework 2.4.x

Question

I have a java play framework 2.4.x web app providing a JSON/HTTP API. When I run my front-end HTML/JS file:///Users/nize/tmp/index.html calling the API on

Answer 1

First add/edit these lines(configurations) into your conf/application.conf

 play.filters.cors {
  # allow all paths
  pathPrefixes = ["/"]
  # allow all origins (You can specify if you want)
  allowedOrigins = null
  allowedHttpMethods = ["GET", "POST", "PUT", "DELETE"]
  # allow all headers
  allowedHttpHeaders = null
 }   

(Note that lines starting with '#' are commented lines.)

Then go to build.sbt and add this line.

libraryDependencies += filters

Finally make a Java Class named 'Filters.java' and include this to the root directory(/app).

import play.api.mvc.EssentialFilter;
import play.filters.cors.CORSFilter;
import play.http.HttpFilters;

import javax.inject.Inject;

public class Filters implements HttpFilters {

    @Inject
    CORSFilter corsFilter;

    public EssentialFilter[] filters() {
        return new EssentialFilter[] { corsFilter };
    }
}

You can refer official documentation for more information.