I would like to disable the taxonomy/term/1 page that list the nodes using that taxonomy term. I have found some modules for older Drupal versions, but I haven't found quite what I'm looking for in Drupal 8.
Is there a configuration setting I am missing? Can I use a hook to disable the taxonomy term page, or does this require a module?
The Rabbit Hole module can help you in this task
Rabbit Hole is a module that adds the ability to control what should happen when an entity is being viewed at its own page.
You need to enable the Rabbit Hole and Rabbit Hole taxonomy submodule and then in the admin/structure/taxonomy/manage/YOUR_VOCABULARY page you will see the Rabbit Hole Options.
A lightweight solution is to simply edit the taxonomy term view : /admin/structure/views/view/taxonomy_term
... and restrict the access.
Add a Content revision: ID filter. Set the operator to Is equal to, and input -1
Click Add in the No results behavior options box and add Response status code
Select 404 (Not Found) as the status code to return and add it
Save the view
Step 1 adds a filter that will always fail, because revision ids are positive integers, thus never equal -1. This will make the query always return with no results.
Steps 2 and 3 make Drupal return a proper 404 HTTP code when no results are returned from the query.
