ZeroGPU native support

[cbensimon]

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

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Note

Medium Risk
Touches core request execution/queueing paths (context propagation, multiprocessing-safe progress/log emission) and adds a new middleware integration path, which could affect event handling and streaming behavior on Spaces.

Overview
Adds native Hugging Face Spaces ZeroGPU support via a new gradio/zerogpu.py that conditionally installs spaces.zero.ZeroGPUMiddleware, including custom exception mapping, log emission, disconnect detection, and worker contextualization.

Refactors queued execution to capture and propagate contextvars from /queue/join through route_utils.call_process_api and Blocks.process_api/call_function, covering sync/async and generator functions (including SyncToAsyncIterator), and adds queue-side RPC plumbing for progress/log messages when events run in child processes.

Removes the previous spaces.gradio_auto_wrap behavior, tweaks ZeroGPU detection (SPACES_ZERO_GPU accepts "1"), makes server start timeout configurable via GRADIO_START_TIMEOUT, updates test deps to include spaces, and adds tests ensuring request context propagation and cancellation behavior.

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[gradio-pr-bot]

🪼 branch checks and previews

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

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Install Gradio from this PR

pip install https://huggingface.co/buckets/gradio/pypi-previews/resolve/7dfee1b9bed972badc5abd3b6466849d9b9e1f1e/gradio-6.18.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@7dfee1b9bed972badc5abd3b6466849d9b9e1f1e#subdirectory=client/python"

Import Gradio JS Client from this PR via CDN

import { Client } from "https://huggingface.co/buckets/gradio/npm-previews/resolve/7dfee1b9bed972badc5abd3b6466849d9b9e1f1e/browser.js";

[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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[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

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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