Zerto API – Invoke-rest vs invoke-web

something that always confused me (and this is probably Zerto specific but I’ll throw it out here)

I do all my requests using <strong>invoke-restmethod</strong> execpt 1, the inital <strong>invoke-webrequest</strong> to get my token

for example

$ZertoServer = 'zerto-zvm.internaldomain.local'
$ZertoPort = "9669"
$ZertoUser = "domain\Zerto-account"
$ZertoPassword = "HLlmmt2W4rvcs3hlz8w"

$BaseURL = "https://$($ZertoServer):$($ZertoPort)/v1"

$AuthInfo = ("{0}:{1}" -f $ZertoUser, $ZertoPassword)
$AuthInfo = [System.Text.Encoding]::UTF8.GetBytes($AuthInfo)
$AuthInfo = [System.Convert]::ToBase64String($AuthInfo)

$TokenSplat = @{
Method = 'Post'
SkipCertificateCheck = $true
Uri = "$BaseURL/session/add"
Headers = @{Authorization = ("Basic {0}" -f $AuthInfo) }
Body = @{ "AuthenticationMethod" = "1" } | ConvertTo-Json
ContentType = "application/JSON"
}
# Why in gods green earth dosnt this work with invoke rest?
$RestResponce = Invoke-RestMethod @TokenSplat

$WebResponce = Invoke-WebRequest @TokenSplat
$ZToken = @{"x-zerto-session" = "{0}" -f $WebResponce.headers.get_item("x-zerto-session") }

$AlertsSpat = @{
Headers = $ZToken
Uri = "$BaseURL/alerts"
Method = 'Get'
SkipCertificateCheck = $true
}
$AlertsJSON = Invoke-RestMethod @AlertsSpat

so why does (using all the same details mind you)

$RestResponce = Invoke-RestMethod @TokenSplat # Returns Nothing
$WebResponce = Invoke-WebRequest @TokenSplat # Returns my session

I see it in everyone’s examples, and its something I don’t understand why <strong>invoke-restmethod</strong> couldn’t achieve the same thing