Project, gist and news endpoints: browsing and detail reads, create/edit/delete, private and read-only flags, zip export and fork jobs with their polling endpoints, and the news listing and article reads.
The polymorphic report endpoint, the machine-readable reason list, and the administrator moderation queue: its state machine, actions, seniority rule and acknowledgement contract with the published review window.
The JSON lookup endpoints behind mentions and the message composer: user search and content search, their single q parameter, result caps and response shapes.
Background-job endpoints for the three public developer tools: queueing a run, polling status, reading the report, and the progress websockets - all addressed by unguessable capability URLs.
Toggle-style engagement endpoints for posts, comments, gists, projects and quizzes: vote casting and removal, emoji reactions, bookmarks and poll answers, including the X-Requested-With header rule that returns JSON inst...
Registering browser and APNs push subscriptions: discovering enabled providers via push.json, fetching the public VAPID key, posting a PushSubscription, and the client-side unsubscribe model with no server endpoint.