#1369 eSCL scanning issue with HP LaserJet Flow MFP E52645 (HTTP 409 Conflict)

[Mariton Maia]

First of all, thank you for developing NAPS2.
I would like to report a compatibility issue I found when using the eSCL driver with an HP Enterprise multifunction printer.

Device information:
Model: HP LaserJet Flow MFP E52645
Firmware (Date Code): 20260311
Connection: Network (eSCL)
Operating System: Windows

NAPS2 is able to discover the scanner successfully via eSCL. However, when I start a scan, it immediately fails with the following error:

Response status code does not indicate success: 409 (Conflict).

The stack trace is:

System.Net.Http.HttpRequestException: Response status code does not indicate success: 409 (Conflict).
at HttpResponseMessage.EnsureSuccessStatusCode()
at NAPS2.Escl.Client.EsclClient.CreateScanJob(EsclScanSettings settings)
at NAPS2.Scan.Internal.Escl.EsclScanDriver.CreateScanJobAndCorrectInvalidSettings(...)
...

I have attached a screenshot of the error dialog.

The scanner is detected correctly, so communication with the device appears to be working. The failure only occurs when NAPS2 attempts to create the scan job (CreateScanJob).

Additional information:

The scanner is discovered successfully via eSCL.
The HTTP 409 response is returned when CreateScanJob is sent.
This appears to be specific to the HP Enterprise eSCL implementation.
It would be helpful if NAPS2 could log the complete XML request and the XML response returned by the scanner when a 409 Conflict occurs, as this may identify which scan parameter the device is rejecting.

Thank you for your excellent work on NAPS2.

Best regards,