Trying to write an ICAP client to connect to SAV-DI, getting strange response from SAV-DI when i send a preview, gives code 204 when should be 100 i think. Does SAV-DI ICAP server user previews or not?

I am trying to implement ICAP capabilities into SAV-DI to scan files and have currently got a service that seems to work for the most part. However I am encountering a problem.

 When I send the IP and port to the ICAP server a preview size is also required. If I supply a preview size then it works up to a point, the preview of the file is scanned correctly but then the rest of the file is not scanned. The ICAP response from SAV-DI should be 100, but instead it is coming back as 204, even though allow 204 is not enabled. But the main issue is that it is not scanning the whole file, it just treats the preview as the whole message.

If I do not supply a preview size then SAV-DI should generate one and return it back to the client, but this is also not happening.

Is it the case that SAV-DI simply doesn’t use a preview or is there an error?