Azure Document Intelligence from serverless function leads to azure.core.exceptions.ServiceRequestError: EOF

Question

When I call the Azure Document Intelligence API from a modal serverless function, I get this "azure.core.exceptions.ServiceRequestError: EOF occurred in violation of protocol (_ssl.c:2396)" error. It works for small documents, but I face this SSL issue for longer documents that take over 2 min to process.

The Azure Document Intelligence API works fine every time when I call it from my machine or AWS ec2 instance for all document sizes, but I'm having issues when calling from a modal serverless function. How should I debug? Please help.

Here is the full error message:

Traceback (most recent call last):
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  File "/pkg/modal/_container_entrypoint.py", line 372, in handle_input_exception
    yield
  File "/pkg/modal/_container_entrypoint.py", line 602, in run_input
    value = await res
  File "/root/cloud_functions_filings.py", line 171, in scrape_chunk_embed_filings
    _, tables_list, sections_list = await process_pdf(
  File "/root/services/ocr.py", line 206, in process_pdf
    for future in futures:
  File "/usr/local/lib/python3.10/concurrent/futures/_base.py", line 621, in result_iterator
    yield _result_or_cancel(fs.pop())
  File "/usr/local/lib/python3.10/concurrent/futures/_base.py", line 319, in _result_or_cancel
    return fut.result(timeout)
  File "/usr/local/lib/python3.10/concurrent/futures/_base.py", line 451, in result
    return self.__get_result()
  File "/usr/local/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
    raise self._exception
  File "/usr/local/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/root/services/ocr.py", line 189, in