Empty API response after moving from Python to Powerhsell

Question

I developed a bot to scrape some info via "API" in Python and now I want to change the stack to Powershell.

I'm having difficulties with one of the requests. In Python it works like a charm but on Powershell I'm unable to make it work in the same way.

In Python, I just create the payload

  arrayWebCodes = ["PR1234", "PR3456"]
  payloadStock={
        "productsCN[]": arrayWebCodes ,
        "productsCC[]": arrayWebCodes 
    }
  response = s.post(urlStock, data=payloadStock)

This is because I want to obtain info for multiples products in a single call.

When I try to implement same on Powershell, response is empty.

$arrayProducts = @("PR1234", "PR73456")
$payloadStock = [ordered]@{
    "productsCN[]" = $arrayProducts
    "productsCC[]" = $arrayProducts
}
$response = Invoke-WebRequest -Uri $urlStock -body $payloadStock -Method "POST" -WebSession $webSession

Somehow, Powershell Hashtables of Arrays have some differences with Python dictionary of arrays I'm trying to implement here.

If I implement the request with only one code in Powershell, it works. So if I go from:

$codProduct1 = "PR1234"
$codProduct2 = "PR3456"
$payloadStock = [ordered]@{
    "productsCN[]" = $codProduct1, $codProduct2
    "productsCC[]" = $codProduct1, $codProduct2
}
$response = Invoke-WebRequest -Uri $urlStock -body $payloadStock -Method "POST" -WebSession $webSession

to:

    $codProduct1 = "PR1234"
    $codProduct2 = "PR3456"
    $payloadStock = [ordered]@{
        "productsCN[]" = $codProduct1
        "productsCC[]" = $codProduct1
    }
    $response = Invoke-WebRequest -Uri $urlStock -body $payloadStock -Method "POST" -WebSession $webSession

It Works...

I'm about to quit, any help is really appreciated.

Answer 1

Not really the answer to your issue, but just to be sure.
This should be the same:

Python

import json

arrayWebCodes = ["PR1234", "PR3456"]
payloadStock={
    "productsCN[]": arrayWebCodes ,
    "productsCC[]": arrayWebCodes 
}
print(json.dumps(payloadStock))

{"productsCN[]": ["PR1234", "PR3456"], "productsCC[]": ["PR1234", "PR3456"]}

PowerShell

$arrayProducts = @("PR1234", "PR73456")
$payloadStock = [ordered]@{
    "productsCN[]" = $arrayProducts
    "productsCC[]" = $arrayProducts
}
$payloadStock | ConvertTo-Json -Compress

{"productsCN[]":["PR1234","PR73456"],"productsCC[]":["PR1234","PR73456"]}

I suspect that the Invoke-WebRequest -body might have the same -Depth default issue as for unexpected ConvertTo-Json results? Answer: it has a default -Depth of 2.
What happens if you provide the -body as a (json) string:

$jsonPayload = $payloadStock | ConvertTo-Json -Compress -Depth 9
$response = Invoke-WebRequest -Uri $urlStock -body $jsonPayload -Method GET -WebSession $webSession