The Docker image now runs Python 3.12 on Debian 13 (trixie) instead of Python 3.11 on Debian 12, and the pip install docs recommend 3.12. Image size stays about the same: the slim image is 1 MB smaller and the standard image is about 50 MB larger, mostly from the newer ffmpeg and pandoc that Debian 13 ships. Admins should know that custom functions, tools and anything installed with pip inside the container now run on Python 3.12, so a package that only has builds for 3.11 needs a newer version. Installing with pip still works on both Python 3.11 and 3.12.
With delta streaming most websocket frames are tiny per-token deltas, and
per-message-deflate pays zlib work on every outgoing frame per subscriber for
near-zero gain there; under heavy streaming that shows up as measurable server
CPU. The frames that still benefit are the rare large ones (final message,
sources), and even a 100k token message is only a few hundred KB uncompressed,
which any network delivers without noticeable delay.
UVICORN_WS_PER_MESSAGE_DEFLATE=false (default true, current behavior) disables
the extension in every entry point: open-webui serve and dev, start.sh both
invocations, start_windows.bat and dev.sh. Verified against a running
instance: with the flag off the server declines the client-offered
permessage-deflate extension, with defaults it still negotiates it.
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