Consume Azure ML Web Service with Postman: how to pass arguments?

Question

Is it possible to pass parameters to an Azure ML Web Service with Postman? I created an R web service endpoint that runs in an Azure Container Instance. My run function has one argument ("data"). I can call the web service using Azure ML R SDK (using invoke_webservice()) and the input parameter is read successfully from the request content. The input is constructed like:

toJSON(data.frame(data="This is my test string"))

Result:

[{"data": "This is my test string"}]

If I create a Postman request and copy the input to the request body, the input parameter is not passed to the web service. The web service can return a static output to Postman but the variable data is always empty. Is this a property of the ML Web Service? If not, how can I set up the request body so that the argument is read successfully? I have tried many variations, but none have worked.

I have set content-type header to application/json. I don't have authentication in the web service, since it is just a test instance.

Ultimately, we need to call the web service with C# from Azure Function. I know that we can use the C# template from documentation and it can probably pass the parameter to the web service, but it would be nice to be able to test the web service with Postman.

Answer 1

Try this in postman.