Categories as displayed as https://meta.discourse.org/c/support/6
where support has an id of 6 and can also be referenced as https://meta.discourse.org/c/6
topics are displayed as https://meta.discourse.org/t/optimising-discourse-urls/204974/
where the topic id is 204974 and can also be referenced as https://meta.discourse.org/t/204974/
a specific post is displayed as https://meta.discourse.org/t/optimising-discourse-urls/204974/2
where the topic id is 204974 and the post id is 2 and can also be referenced as https://meta.discourse.org/t/204974/2/