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how to compose the request body of invoke web service

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Posted on by RickMa

Hi All,

I am working on an automation with Azure cognitive API which will need to submit an image file from local directory to Azure service. I am using

'Content-Type': 'application/octet-stream'

in request header of Invoke web service action in PAD, but did not find a way to compose the request body accepted by Azure service. I tried to use convert file to binary action for a selected JPG file and directly use the output in the request body.

However, there is an error "{"error":{"code":"InvalidImage","message":"The file submitted couldn't be parsed. This can be due to one of the following reasons: the file format is not supported ( Supported formats include JPEG, PNG, BMP, PDF and TIFF), the file is corrupted or password protected."}}". It highly appreciated that your experience can shed some light to it.

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Power Automate Desktop

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Deenuji_Loganathan_ 6,255 Moderator on at

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@RickMa

Initially, test the functionality using the Postman app to ensure everything operates smoothly. Afterward, replicate the parameters in the PAD invoke web service action. This approach will help avoid unnecessary issues within PAD.
Thanks,

Deenuji Loganathan 👩‍💻
Automation Evangelist 🤖
Follow me on LinkedIn 👥

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RickMa 29 on at

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Thanks for feedback. I actually succeeded in call the API in Python with below code, but cannot replicate the way in PAD.

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Deenuji_Loganathan_ 6,255 Moderator on at

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@RickMa
According to the documentation, it also supports multipart data.

For uploading some objects, I recommend using PowerShell or Python scripts to invoke Azure AI instead of using the Invoke Web Service, as ultimately, they achieve the same outcome.

If you're open to using PowerShell, please try the link below.

https://powerusers.microsoft.com/t5/Power-Automate-Desktop/How-to-attach-excel-file-in-Invoke-web-service-action-of-PAD-API/m-p/2667423

Thanks,
Deenuji Loganathan 👩‍💻
Automation Evangelist 🤖
Follow me on LinkedIn 👥

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RickMa 29 on at

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I tried another call from Postman which is successful and still cannot translate the same request in PAD invoke Web service action. The request body in Postman is a binary data, but "Invoke Web service" did not accept the output form "Convert file to binary" action.

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