CAS provides a http package compatible client implementation for use with securing http frontends in golang.

import "gopkg.in/cas.v2"

Installing goes like this (have your go.mod file ready):

go get github.com/cloudogu/go-cas/v2

Documentation is available at: http://godoc.org/gopkg.in/cas.v2 Examples are included in the documentation but are also available in the _examples directory.

It is possible to override the log-out detection with a custom one by providing a function

package yourpackage

import (
	"net/http"

	cas "github.com/cloudogu/go-cas"
)

func yourCode(next http.Handler) {
	browserClient := cas.NewClient(&cas.Options{
		//...
		IsLogoutRequest: func(r *http.Request) bool {
			return false // inspect request and react here but be sure to re-add any request bodies that you've read
		},
	})
	browserClient.CreateHandler(next)
}