§Cross-Origin Resource Sharing

Play provides a filter that implements Cross-Origin Resource Sharing (CORS).

CORS is a protocol that allows web applications to make requests from the browser across different domains. A full specification can be found here.

§Enabling the CORS filter

To enable the CORS filter, add the Play filters project to your libraryDependencies in build.sbt:

libraryDependencies += filters

Now add the CORS filter to your filters, which is typically done by creating a Filters class in the root of your project:

import javax.inject.Inject

import play.api.http.HttpFilters
import play.filters.cors.CORSFilter

class Filters @Inject() (corsFilter: CORSFilter) extends HttpFilters {
  def filters = Seq(corsFilter)
import play.api.mvc.EssentialFilter;
import play.filters.cors.CORSFilter;
import play.http.HttpFilters;

import javax.inject.Inject;

public class Filters implements HttpFilters {

    CORSFilter corsFilter;

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

§Configuring the CORS filter

The filter can be configured from application.conf. For a full listing of configuration options, see the Play filters reference.conf.

The available options include:

For example:

play.filters.cors {
  pathPrefixes = ["/some/path", ...]
  allowedOrigins = ["", ...]
  allowedHttpMethods = ["GET", "POST"]
  allowedHttpHeaders = ["Accept"]
  preflightMaxAge = 3 days

Next: Configuring WS SSL

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