Add logic to the function app

Question

Add logic to the function app

William Bao 0

I am following the Exercise - Add logic to the function app using the provided run.ps1 code and the input body (array). When I clicked on Run, the output gave 400 Bad Request and "Please send an array of readings in the request body". I wonder if the provided body wasn't in a proper array format or the provided run.ps1 code has issues?

1 answer

Your answer

Answer 1

Ryan Hill 30,281 Microsoft Employee Moderator

Hey @William Bao

That's most likely the reason for the error. The code is looking for the request to be either https://pwshfuncapp.azurewebistes.net/api/httptrigger1?name=AzureUser] or for the request body be

{
   "name": "AzureUser"
}

Anything outside of that and the PowerShell script can't parse the request which could lead to a 400 error.

EDIT 2024 November 5 Updating my answer to reflect the code sample you shared below. When passing the following request

{
    "readings": [
        ...
    ]
}

You would use $request.Body.readings. For PowerShell functions, the body is parsed into a hashtable, so the properties are case-sensitive. You were able to resolve your issue by making passing Reading as the JSON payload object.

William Bao 0

Hi Ryan,

I couldn't open the link attached to your answer.

In the function I created using HTTP trigger, the provided run.ps1 is

using namespace System.Net

param($Request, $TriggerMetadata)

Write-Host "Drive Gear Temperature Service triggered"

$readings = $Request.Body.Readings
if ($readings) {
    foreach ($reading in $readings) {
        if ($reading.temperature -le 25) {
            $reading.Status = "OK"
        }
        elseif ($reading.temperature -le 50) {
            $reading.Status = "CAUTION"
        }
        else {
            $reading.Status = "DANGER"
        }

Write-Host "Reading is $($reading.Status)"
    }

$status = [HttpStatusCode]::OK
    $body = $readings
}
else {
    $status = [HttpStatusCode]::BadRequest
    $body = "Please send an array of readings in the request body"
}

Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
    StatusCode = $status
    Body = $body
})

The function.json was left as default. Under Test/Run, the input body is

{
    "readings": [
        {
            "driveGearId": 1,
            "timestamp": 1534263995,
            "temperature": 23
        },
        {
            "driveGearId": 3,
            "timestamp": 1534264048,
            "temperature": 45
        },
        {
            "driveGearId": 18,
            "timestamp": 1534264050,
            "temperature": 55
        }
    ]
}

Do you mean I should add the "name" key inside the input body?

Thanks

William Bao 0

Solved it by changing "readings" to "Readings".

{
    "Readings": [
        {
            "driveGearId": 1,
            "timestamp": 1534263995,
            "temperature": 23
        },
        {
            "driveGearId": 3,
            "timestamp": 1534264048,
            "temperature": 45
        },
        {
            "driveGearId": 18,
            "timestamp": 1534264050,
            "temperature": 55
        }
    ]
}

SiddeshTN 5,345 Reputation points Microsoft External Staff

2024-11-05T05:37:32.9666667+00:00

Hi William Bao,

Thank you for reaching out to us on the Microsoft Q&A forum.

We're pleased to hear that your issue has been resolved.
If you have any further questions / need additional assistance in the future, please feel free to reach out.

Please "Accept the Answer" & "Upvote".
SiddeshTN 5,345 Reputation points Microsoft External Staff

2024-11-06T08:16:06.19+00:00

Hi William Bao,

Thank you for reaching out to us on the Microsoft Q&A forum.

We're pleased to hear that your issue has been resolved.
If you have any further questions / need additional assistance in the future, please feel free to reach out.

Please "Accept the Answer" & "Upvote".

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Add logic to the function app

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