Default Interceptors

If your service-map.adoc does not include the key :io.pedestal.http/interceptors, then Pedestal will create a vector of default interceptors for you.

The default interceptors are added to your service map when you call either api:create-servlet[], or api:create-server[].

This document explains which interceptors are added under different conditions. Each interceptor has its own documentation that describes its specific behavior.

If your service map already includes the key :io.pedestal.http/interceptors when you call one of the create- functions, then Pedestal won’t add the default interceptors. So what should you do if you want to use the default interceptors, but want to add your own interceptors to the default stack?

The solution is to call api:default-interceptors[] yourself, before calling create-server or create-servlet. That way, default-interceptors can build the default stack, then your application code has an opportunity to modify it. By the time you call create-server or create-servlet, the :io.pedestal.http/interceptors key will have your modified version of the default interceptors.

Here is an example of adding interceptors to perform authentication and authorization on every request. (Assuming we have a namespace auth with functions to construct these interceptors given a configuration.)

Some of the default interceptors are conditional. Pedestal adds them when other parts of the service map indicate a need for an interceptor. These will be noted below.

These are presented in the order that they appear in the interceptor vector. That means their enter functions will be called in the order they appear in this document, and their leave functions are called in reverse order.