== CORS

RESTEasy has a `ContainerRequestFilter` that can be used to handle CORS preflight and actual requests. `org.jboss.resteasy.plugins.interceptors.CorsFilter`.
You must allocate this and register it as a singleton provider from your Application class.
See the javadoc or its various settings. 

[source,java]
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CorsFilter filter = new CorsFilter();
filter.getAllowedOrigins().add("http://localhost");
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