René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug] RestrictedWorkflowAccessError on async context manager in return close of an activity.","articleBody":"### What are you really trying to do?\n\nWhen using \n\n```\n@register_activity\n@activity.defn\nasync def get_http_response(URL: str) -\u003e dict:\n    async with httpx.AsyncClient() as client:\n        return await client.get(url)\n```\n\n### Describe the bug\n\nWe get the following error:\n\n\u003e **RestrictedWorkflowAccessError**\n\u003e Cannot access threading.local.__mro_entries__ from inside a workflow. If this is code from a module not used in a workflow or known to only be used deterministically from a workflow, mark the import as pass through.\n\n### Minimal Reproduction\n\nI believe the workflow sandbox is reactivated before the asynclient `__aexit__` code.\nWhich leads to Temporal thinking its execution is happening in the workflow scope rather than within the activity one.\n\n### Environment/Versions\n\ntemporal==1.10.0\n\n### Additional context\n\nI'm trying to split it in two calls to make it work:\n\n```\n@register_activity\n@activity.defn\nasync def get_http_response(URL: str) -\u003e dict:\n    async with httpx.AsyncClient() as client:\n        response = await client.get(url)\n    return response\n```\n","author":{"url":"https://github.com/Natim","@type":"Person","name":"Natim"},"datePublished":"2025-06-09T09:14:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/192/samples-python/issues/192"}