https://huggingface.co/spaces/retopara/ragflow/resolve/main/sdk/python/test/test_sdk_api/test_data/test.pdf
hf download hf://spaces/retopara/ragflow/sdk/python/test/test_sdk_api/test_data/test.pdf
curl -L -o test.pdf https://huggingface.co/spaces/retopara/ragflow/resolve/main/sdk/python/test/test_sdk_api/test_data/test.pdf
