Query vCO workflow using REST API from PowerShell

Hello,

I am trying to query a vCO workflow by name using the REST API from PowerShell based on this article:

http://www.vcoteam.info/articles/learn-vco/268-how-to-use-the-rest-api-to-start-a-workflow.html

$username = 'XXXXXX'

$upassword = 'XXXXXX'

$auth = $username + ':' + $upassword

$Encoded = [System.Text.Encoding]::UTF8.GetBytes($auth)

$EncodedPassword = [System.Convert]::ToBase64String($Encoded)

$headers = @{"Authorization"="Basic $($EncodedPassword)";}

$body = "<execution-context xmlns='http://www.vmware.com/vco'></execution-context>"

#query for workflow named "donothing"

Invoke-RestMethod -uri https://XXXX:8281/api/workflows/?conditions=name=donothing -Headers $headers -Body $body -ContentType "application/xml" -Method Get

Invoke-RestMethod : Cannot send a content-body with this verb-type.

At line:1 char:1

+ Invoke-RestMethod -uri https://XXXX:8281/api/workflows/?conditions=name=donoth ...

+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    + CategoryInfo          : NotSpecified: (:) [Invoke-RestMethod], ProtocolViolationException

    + FullyQualifiedErrorId : System.Net.ProtocolViolationException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand

The query succeeds using the REST client on Firefox, but I cannot get it to work on PowerShell. (NOTE: execution of workflows from PowerShell works fine)

Any help is appreciated.

Thanks,

Juan.