public void run(Configuration conf, Environment environment)  {

    // Enable CORS headers

    final FilterRegistration.Dynamic cors =

        environment.servlets().addFilter("CORS", CrossOriginFilter.class);

    // Configure CORS parameters

    cors.setInitParameter("allowedOrigins", "*");

    cors.setInitParameter("allowedHeaders", "X-Requested-With,Content-Type,Accept,Origin");

    cors.setInitParameter("allowedMethods", "OPTIONS,GET,PUT,POST,DELETE,HEAD");

    // Add URL mapping

    cors.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");

}

public void run(Configuration conf, Environment environment)  {

    // Enable CORS headers

    final FilterRegistration.Dynamic cors =

        environment.servlets().addFilter("CORS", CrossOriginFilter.class);

    // Configure CORS parameters

    cors.setInitParameter("allowedOrigins", "*");

    cors.setInitParameter("allowedHeaders", "X-Requested-With,Content-Type,Accept,Origin,X-Export-Result");
    cors.setInitParameter("allowedHeaders", "X-Export-Result");

    cors.setInitParameter("allowedMethods", "OPTIONS,GET,PUT,POST,DELETE,HEAD"); 
    // Add URL mapping 
    cors.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*"); }

allowedOrigins

a comma separated list of origins that are allowed to access the resources. Default value is *, meaning all origins.

If an allowed origin contains one or more * characters (for example http://*.domain.com), then "*" characters are converted to ".*", "." characters are escaped to "\." and the resulting allowed origin interpreted as a regular expression.

Allowed origins can therefore be more complex expressions such as https?://*.domain.[a-z]{3} that matches http or https, multiple subdomains and any 3 letter top-level domain (.com, .net, .org, etc.).

allowedTimingOrigins

a comma separated list of origins that are allowed to time the resource. Default value is the empty string, meaning no origins.

The check whether the timing header is set, will be performed only if the user gets general access to the resource using the allowedOrigins.

allowedMethods

a comma separated list of HTTP methods that are allowed to be used when accessing the resources. Default value is GET,POST,HEAD

allowedHeaders

a comma separated list of HTTP headers that are allowed to be specified when accessing the resources. Default value is X-Requested-With,Content-Type,Accept,Origin. If the value is a single "*", this means that any headers will be accepted.

preflightMaxAge

the number of seconds that preflight requests can be cached by the client. Default value is 1800 seconds, or 30 minutes

allowCredentials

a boolean indicating if the resource allows requests with credentials. Default value is true

exposedHeaders

a comma separated list of HTTP headers that are allowed to be exposed on the client. Default value is the empty list

chainPreflight

if true preflight requests are chained to their target resource for normal handling (as an OPTION request). Otherwise the filter will response to the preflight. Default is true.