👀 Views: 3 💬 Answers: 1 📅 Created: 2025-06-09

PowerShell API Invoke-RestMethod Authentication

I'm performance testing and I'm having a hard time understanding I'm writing unit tests and I'm currently working on a script that needs to call a REST API which requires a custom authentication token in the header. However, I'm running into an scenario where the API returns a 401 Unauthorized behavior even though I've confirmed that the token is correct. I've tried using `Invoke-RestMethod` with the `-Headers` parameter to include my authentication token, but it doesn't seem to be working as expected. Here's the code snippet I used: ```powershell $uri = 'https://api.example.com/data' $token = 'Bearer my_custom_token' $headers = @{ 'Authorization' = $token } $response = Invoke-RestMethod -Uri $uri -Method Get -Headers $headers ``` When I run this code, I get the following behavior: ``` Invoke-RestMethod : The remote server returned an behavior: (401) Unauthorized. ``` I've checked the token format and made sure there are no extra spaces or line breaks. Additionally, I have also tried using a different method to set the header, like this: ```powershell $headers = New-Object System.Net.WebHeaderCollection $headers.Add('Authorization', $token) $response = Invoke-RestMethod -Uri $uri -Method Get -Headers $headers ``` But I still receive the same behavior. I suspect that there might be some scenario with how PowerShell handles the headers, especially with the `Bearer` prefix. Is there a specific format I need to follow for custom headers in PowerShell 7.3? Any insights on how to troubleshoot this would be greatly appreciated. The stack includes Powershell and several other technologies. What's the best practice here? The stack includes Powershell and several other technologies. This is part of a larger web app I'm building.