Error Handling for Invoke-RestMethod - Powershell

问题:

I have a powershell script using the Skytap API (REST). I would like to catch the error, if there is one, and try to display it.

For example, we are changing the IP:

Invoke-RestMethod -Uri https://cloud.skytap.com/configurations/XXXXXX/vms/YYYYYY/interfaces/ZZZZZZ?ip=10.0.0.1 -Method PUT -Headers $headers

If the IP is used somewhere else, I will get the 409 Conflict Error (Request is well-formed but conflicts with another resource or permission).

I would like to check if the error is 409 and then tell it to do something else about it.

回答1:

This is somewhat awkward but the only way to do it as far as I know without doing something more complicated like using .NET's WebRequest and ConvertFrom-Json (or whatever data format you are expecting).

try {
    Invoke-RestMethod ... your parameters here ... 
} catch {
    # Dig into the exception to get the Response details.
    # Note that value__ is not a typo.
    Write-Host "StatusCode:" $_.Exception.Response.StatusCode.value__ 
    Write-Host "StatusDescription:" $_.Exception.Response.StatusDescription
}