[BUG] When batching, Invoke-PnPSPRestMethod DELETE operations have multiple "IF-MATCH" headers

[joshtransient]

Expected behavior

New-PnPBatch should not be making requests with duplicate headers.

Actual behavior

Throws an error message: InvalidOperation: The header 'IF-MATCH' was specified multiple times. Each header must appear only once in a batch part.

Steps to reproduce behavior

Run this script (replacing @(1,2,3) with user IDs in the site with active PnP context:

$batch = New-PnPBatch
foreach($userId in @(1,2,3)) {
  Invoke-PnPSPRestMethod -Method DELETE -Url "/_api/Web/SiteUsers/GetById($userId)" -Batch $batch
}
$result = Invoke-PnPBatch -Batch $batch

What is the version of the Cmdlet module you are running?

2.12

Which operating system/environment are you running PnP PowerShell on?

• Windows
• Linux
• MacOS
• Azure Cloud Shell
• Azure Functions
• Other : please specify

[KoenZomers]

Thanks for the clear repro steps @joshtransient . On it.

[KoenZomers]

It will be fixed once this PR in PnP Core will be merged pnp/pnpcore#1635

[gautamdsheth]

hey @joshtransient , this has been fixed today.
Will be available in tomorrow's nightly builds as well as the next major version coming soon.

Thanks for raising this issue.

[joshtransient]

Thank you @gautamdsheth and @KoenZomers for the quick turnaround!