receiving http Post/Push data

[Bruce Steers <bsteers4@xxxxxxxxx>]

I have in my gambas program a method that connects to a url that is a
gb.web cgi script

this url when opened checks the QUERY_STRING and returns data depending on
the arg.

but i also want to upload some text data to it.

I have this function...
Public Sub btnUpload_Click()

  Dim sRes As String
  Dim s As String = File.LoadArchive(File.SetExt(ESettings.Path, "zx"),
True)

  With $hTp = New HttpClient As "HTP"
    .URL = $sHost &/ $sScoreAppPath & "?submit"
    .Post("text/plain", s)
   ' .Push("text/plain", s)  ' tried this way too
  End With

End

Then on the server-side the cgi-script runs and it detects the "submit" but
i cannot figure out how to access the sent data on the server.
I looked at all the CGI[Key] keys, it's not there , Content-Length: is
filled and correct but wheres the text data that was sent?

Cheers for any advice
BruceS