Blogs undertow
How to make use of JASPI with a standalone Undertow.
How to implement a configure a custom HTTP authentication mechanism.
A blog post describing how to override the authentication policy of an existing web application and add SPNEGO authentication to it.
Although developed for use within the WildFly application server the WildFly Elytron project can also be used in isolation, this blog post demonstrates how it can be used to secure an embedded Undertow server.
An early blog post describing how SSL configuration was being centrally defined within a new subsystem. Written early 2016 it is potentially due to be reviewed as exact commands may have evolved since it was written.