v4: the API's JSON and the page are sent compressed — a page of the feed went out as it was, twenty kilobytes where a fifth does: only the built frontend's files were compressed, at build time, and Deno's server leaves alone a response whose length Oak has set. compressMiddleware (api/middleware/compress.ts), installed after the error middleware and around everything that sets a body, sends an object or array, and a string whose type its route set, in brotli or gzip as the request's Accept-Encoding takes, a coding refused with q=0 not being taken, from a kilobyte up, the threshold the build compresses from. Brotli is at quality 5, the frontend's files, compressed once, staying at 11. Files, streams and bytes, a response already encoded, a HEAD and one marked no-transform go out as they are, and a compressible answer says Vary: Accept-Encoding whether compressed or not.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

API.md

@@ -105,6 +105,9 @@ status. A list answers `{ "items", "hasMore" }` and takes `?page=` (from 1) and
 thumbnail, waveform, cover or attachment takes the owner's media token as
 `?token=`.
 
+JSON answers of a kilobyte or more are compressed, in brotli or gzip, for a
+client that accepts it.
+
 ### me
 
 - `GET /api/me` — signed in. The caller's own user.