ENOMEM when using urequests on MicroPython
If you’re making https requests with the MicroPython requests module, you might encounter ENOMEM errors. For me, they appeared after every 2nd request to a different HTTPS endpoint - first endpoint request would always succeed. Weird stuff. Anyway, go get your own copy of the requests library from the MicroPython repo, and find where the requests function is returning a Request object. Library download link here
You’ll notice that, before it, there are a bunch of error cases, and the socket is closed in case of those. In case of a successful HTTP response, however, the socket is not closed.
Close it.
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resp = Response(s)
resp.status_code = status
resp.reason = reason
if resp_d is not None:
resp.headers = resp_d
+ s.close()
return resp
I have no idea what the side effects are - my device is a throwie, it will reset itself if the code fails. I do know that this made the ENOMEM error disappear.
After modifying this, upload this onto your device, and make sure that it is called instead of the builtin - I named my lib urequests.py and did import urequests. gl.
If you think that this is bad advice, contact me somehow and let me know. Cheers!