Root cause of '400: Bad Request: there is no document in the request' on
chunked uploads of compressible files (MP4, zip, text, etc.):
Bun.gzipSync() returns a plain Uint8Array, NOT a Buffer. Telegraf
(sendDocument/sendVideo) only recognises Buffer/Blob/stream sources as
file uploads — a plain Uint8Array produces an empty multipart body and
Telegram rejects the request.
Verified via isolated forwardToStorage probes:
- raw Buffer chunk (.bin, MP4) -> OK
- plain Uint8Array chunk -> FAIL: there is no document
- Buffer.from(gzip) chunk -> OK (after fix)
- .gz extension on Uint8Array did NOT help (rules out MIME/extension)
This only affected chunked uploads of compressible files; incompressible
files (random .bin) worked by accident because gzip didn't shrink them so
the raw Buffer was forwarded unchanged.
asepharyana
d296e0ebcf