"Strict slash" in Beego router

router.go

// Put this in your router.go
// I wasn't able to find any settings for this in Beego, so I created this middleware.

import "strings"

beego.InsertFilter("*", beego.BeforeExec, func(ctx *context.Context) {
	path := ctx.Request.URL.Path
	if path[len(path)-1] != '/' && strings.Index(path, "/static/") != 0 {
		ctx.Redirect(301, path+"/")
	}
})

The correct version is:
beego.InsertFilter("*", beego.BeforeRouter, func(ctx *context.Context)