ZeroGPU native support

[cbensimon]

• Sibling PR: https://github.com/huggingface/pyspaces/pull/102

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Note

Medium Risk
Adds conditional ZeroGPU middleware and new multiprocessing-aware queue message routing, which can affect request handling and progress/log delivery on Spaces. Risk is moderate due to concurrency/process-boundary behavior changes gated by environment flags.

Overview
Adds native ZeroGPU support by conditionally installing spaces.zero.ZeroGPUMiddleware when running in a ZeroGPU Space, including mapping ZeroGPU errors into Gradio Errors and emitting logs via Gradio’s logger.

Introduces MultiprocessWorkerContextualizer to refresh LocalContext in persistent worker processes and updates queue progress/log messaging to optionally forward updates from child processes back to the main server process when GRADIO_QUEUE_MULTIPROCESSING_ENABLED=true.

Also removes legacy spaces.gradio_auto_wrap wrapping of BlockFunction, makes server start timeout configurable via GRADIO_START_TIMEOUT, and updates test/deps tooling to include spaces>=0.50.dev0 (and avoid pin exclusion for spaces).

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	building...
🦄	Changes	detected!	Details

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Install Gradio from this PR

pip install https://huggingface.co/buckets/gradio/pypi-previews/resolve/6bb3b3b5e236ffa8e9db8cc15028491d05dbae77/gradio-6.14.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@6bb3b3b5e236ffa8e9db8cc15028491d05dbae77#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/6bb3b3b5e236ffa8e9db8cc15028491d05dbae77/gradio-client-2.2.0.tgz

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
gradio	minor

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• ZeroGPU native support

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✅ Changeset approved by @freddyaboulton

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[freddyaboulton]

This approach looks good to me @cbensimon

[cbensimon]

This approach looks good to me @cbensimon

For context I am working on sibling PR:

• https://github.com/huggingface/pyspaces/pull/102

I'll add the ZeroGPUMiddleware registration part once ready on spaces side

PS: spaces will still contain a gradio "compat mode" that registers the middleware + patches Gradio queue for older Gradio versions

Keeping you updated!

[freddyaboulton]

Code looks good @cbensimon ! Tried to test myself with spaces 0.50.0 dev version but the spaces image is hardcoding version 0.48

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

There are 3 total unresolved issues (including 1 from previous review).

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