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31.3. PostProcessInterceptors The org.jboss.resteasy.spi.interception.PostProcessInterceptor runs after the JAX-RS method was invoked but before MessageBodyWriters are invoked. They can only be used on the server side. Use them if you need to set a response header when there might not be any MessageBodyWriter invoked. They are there for symetry with PreProcessInterceptor. They do not wrap anything and are invoked in order like PreProcessInterceptors are. public interface PostProcessInterceptor { void postProcess(ServerResponse response); }