PS invoke-webrequest fails with unauthorized

[Aditya Sharma]

Hi Guys,

I have been connecting to jira enterprise for long time now and suddenly the invoke-webrequest powershell script with authorization header (with pat ) stops working and just throws unauthorized.

The same pat token works with c# code to call the rest api and even works with curl. Any help or idea will help me correct my invoke-webrequest because this was working before but not sure after which version of atlassian invoke-webrequest has stopped working.

My internal team is also not able to help either on this.

[Mercy]

This usually happens when PowerShell handles the `Authorization` header differently than curl or .NET clients. Jira Data Center expects a Basic auth header using the format `Authorization: Basic <base64encoded(username:token)>`, not the Bearer format used for OAuth. When using a personal access token (PAT), you still need to encode an empty username with the token, for example:
```
$pair = ":"
$encoded = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes($pair))
Invoke-WebRequest -Uri "</base64encoded(username:token)>