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POST returns sometimes HTTP code 500

See original GitHub issue

I have a nodered flow which fetches screenshots from security cameras and POSTing them to this docker image running in docker under windows. most of the time, it just works as expected and other times it returns an error 500.

I cannot even tell whether I am doing it somehow wrong or if there is a bug in this docker container. Can you guys help me somehow? Where should I go from here?

The docker log shows this:

172.17.0.1 - - [14/Oct/2020 11:23:32] "POST /model/predict HTTP/1.1" 200 -
172.17.0.1 - - [14/Oct/2020 11:27:35] "POST /model/predict HTTP/1.1" 200 -
172.17.0.1 - - [14/Oct/2020 11:27:38] "POST /model/predict HTTP/1.1" 200 -
172.17.0.1 - - [14/Oct/2020 11:28:28] "POST /model/predict HTTP/1.1" 200 -
[2020-10-14 11:30:53,323] ERROR in app: Exception on /model/predict [POST]
Traceback (most recent call last):
File "/opt/conda/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/opt/conda/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/opt/conda/lib/python3.7/site-packages/flask_restplus/api.py", line 319, in wrapper
resp = resource(*args, **kwargs)
File "/opt/conda/lib/python3.7/site-packages/flask/views.py", line 89, in view
return self.dispatch_request(*args, **kwargs)
File "/opt/conda/lib/python3.7/site-packages/flask_restplus/resource.py", line 44, in dispatch_request
resp = meth(*args, **kwargs)
File "/opt/conda/lib/python3.7/site-packages/flask_restplus/marshalling.py", line 136, in wrapper
resp = f(*args, **kwargs)
File "/workspace/api/predict.py", line 89, in post
image = model_wrapper._read_image(image_data)
File "/workspace/core/model.py", line 62, in _read_image
image = Image.open(io.BytesIO(image_data)).convert("RGB")
File "/opt/conda/lib/python3.7/site-packages/PIL/Image.py", line 2818, in open
raise IOError("cannot identify image file %r" % (filename if filename else fp))
OSError: cannot identify image file <_io.BytesIO object at 0x7f8394db9d70>
172.17.0.1 - - [14/Oct/2020 11:30:53] "POST /model/predict HTTP/1.1" 500 -

Issue Analytics

State:
Created 3 years ago
Comments:7 (4 by maintainers)

Top GitHub Comments

1reaction

MLnickcommented, Oct 16, 2020

@fabsenet thank you for opening the issue. It did highlight that we need to harden the error handling and should return a 400 rather - this would have told you that the issue was with your input. So thanks again, it is helpful for us!

0reactions

fabsenetcommented, Oct 16, 2020

I investigated further and the source for the image (blueiris) is itself sometimes returning http status 503. My flow does not check this code but it used the payload, which is an empty array then. so I understand this now better. The object detection is not the problem.

Sorry to take your time 😦