I am making an api call to download a detailed report from a specified build using powershell. This is done in a pipeline environment so I must use powershell and do not have access to httpie (Which works for me locally). I consistently get a 401 unauthorized error with the following code

$verb = "GET"

$hostName = "analysiscenter.veracode.com"

$path = "/api/5.0/detailedreport.do?build_id=27108280"

$timestamp = (Get-Date -UFormat %s).Split('.')[0]

$data = $verb + $timestamp + $path

# Compute the HMAC hash of the data

$hmacsha256 = New-Object System.Security.Cryptography.HMACSHA256

$hmacsha256.Key = [Text.Encoding]::ASCII.GetBytes($veracodeAPISecret)

$signature = $hmacsha256.ComputeHash([Text.Encoding]::ASCII.GetBytes($data))

$signature = [Convert]::ToBase64String($signature)

# URL encode the results

Add-Type -AssemblyName System.Web

$authHeader = "VERACODE-HMAC-SHA256 id=$($veracodeAPIId), ts=$timestamp, sig=$([System.Web.HttpUtility]::UrlEncode($signature))"

# Define the headers for the request

$headers = @{

  Authorization = $authHeader

}

# Make the request

$response = Invoke-WebRequest -Uri "https://$hostName$path" -Headers $headers -Method $verb

The ApiId and ApiKey are set correctly so I believe the issue is in setting the HMAC Header. Does anyone know what Im doing wrong or has anyone had success using Invoke-WebRequest to download the detailedReport