FastAPI intermittent SSLError - EOF occurred in violation of protocol

[kf0mlb]

I've been using your library with my FastAPI project for several months now, and I love it. But just this week I've noticed our UptimeKuma instance reporting an outage on the API 2 or 3 times per day, lasting just a couple of minutes. I just now logged in to review the docker logs and I saw:

2025-03-14 11:17:19,200 - INFO     - 172.17.0.1:40762 - "GET /v1/health HTTP/1.1" 200
2025-03-14 11:17:19,180 - DEBUG    - Posting 1 logged requests to server: https://www.apianalytics-server.com/api/log-request
Exception in thread Thread-921 (_post_requests):
urllib3.exceptions.SSLError: EOF occurred in violation of protocol (_ssl.c:2427)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/requests/adapters.py", line 667, in send
    resp = conn.urlopen(
           ^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py", line 841, in urlopen
    retries = retries.increment(
              ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/urllib3/util/retry.py", line 519, in increment
    raise MaxRetryError(_pool, url, reason) from reason  # type: ignore[arg-type]
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='www.apianalytics-server.com', port=443): Max retries exceeded with url: /api/log-request (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:2427)')))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/threading.py", line 1075, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.12/threading.py", line 1012, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.12/site-packages/api_analytics/core.py", line 55, in _post_requests
    response = requests.post(
               ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/requests/api.py", line 115, in post
    return request("post", url, data=data, json=json, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/requests/api.py", line 59, in request
    return session.request(method=method, url=url, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/requests/sessions.py", line 589, in request
    resp = self.send(prep, **send_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/requests/sessions.py", line 703, in send
    r = adapter.send(request, **kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/requests/adapters.py", line 698, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: HTTPSConnectionPool(host='www.apianalytics-server.com', port=443): Max retries exceeded with url: /api/log-request (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:2427)')))

Then after the API restarts itself, it continues to chug along without issue until the next crash hours later. It seems to be roughly every 12-ish hours.

• python:3.12-slim docker container base
• fastapi 0.115.6
• fastapi-analytics 1.2.3

What other information can I provide?

[tom-draper]

Thanks for reporting this! This seems to be an odd server-side configuration issue. I've pushed an update to handle this error better while I figure out the problem. If you update to 1.2.4 in the meantime things should be improved.

[kf0mlb]

I wanted to update, the crashing appears to have stopped but I continue to get "down status" notifications from UptimeKuma even though the logs show no crashing. I'm going to remove API Analytics for testing, just to see if the middleware is slowing down the response for some reason. I will report back.