How do you create custom zuul filters in spring cloud

Question

I want to write some of my own custom zuul filters for a spring cloud microservice i am writing. Once i have the filter written how do I integrate it so the underlying netflix zuul framework can take advantage of it.

Answer 1

Create a @Bean that extends ZuulFilter. See java configuration examples here. As long as the bean is in the same context as the @EnableZuulProxy app, it will automatically get picked up.

@Bean
public MyFilter myFilter() {
    return new MyFilter();
}

See examples of filters here.

public class MyFilter extends ZuulFilter {
    //...
}

There are three types of filters: pre, route and post and each set of filters is executed in that order (ie all pre's first, routes 2nd and post's 3rd).