HttpResponseError when invoking online endpoint

Question

Dear all, I am trying to score a model created in Azure ML and deployed on an online endpoint. The tutorial says the request should be submitted as in the following code snippet. However, this produces an HttpResponseError with message "A value is not provided for the 'Inputs' parameter". I found nothing about this issue online, so does anybody know how to solve it?

ml_client.online_endpoints.invoke(
    endpoint_name = online_endpoint_name,
    deployment_name = "example",
    request_file = "data_test.json"
)

Answer 1

Hi @Davide Riva

Thank you for using the Microsoft Q&A forum.

To resolve the "HttpResponseError" with message "A value is not provided for the 'Inputs' parameter" when invoking an online endpoint in Azure ML, I suggest you Check if the input parameters are correctly specified in the data_test.json file. Ensure that the request_file parameter is pointing to the correct file location. If possible, try giving full path to the file. Verify that the online endpoint is running and deployed correctly.

If the problem still persists, I suggest you test the online endpoint from the Azure Machine Learning studio portal or POSTMAN portal, to verify if the endpoint is running correctly. Please also check the error logs from the portal, once the endpoint was hit in the portal with the required JSON, parametric values.

I tried to repro the error you were receiving by removing one required parameter from my online endpoint JSON and received below error:
By passing the required number of parameter values, I was able to successfully get the response from the online endpoint. Please see below

I hope you understand. Thank you.

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