Android Question How to get response header from 'ashx' web service using OkHttpUtils2

Sub Process_Globals
    Dim job1 As HttpJob
End Sub

Public Sub checkSerialHistoryNo()
    job1.Initialize("job1",Me)
    job1.Download(http://192.148.0.33/UWS1/UWS/UMSServices.ashx)
    job1.GetRequest.SetHeader("Password","pwd")
    job1.GetRequest.SetHeader("Mode",3)
    job1.GetRequest.SetHeader("SerialNo","123456")
End Sub

Sub JobDone (job As HttpJob)
    Log("JobName = " & job.JobName & ", Success = " & job.Success)
    If job.Success = True Then
                Log(job.GetString)      ' this will give only json string
   Else
        Log("Error: " & job.ErrorMessage)
        ToastMessageShow("Error: " & job.ErrorMessage, True)
    End If
    job.Release
End Sub

Dim ResponseStr As String = GetSNHistory(SerialNo, DealerCode, Mode, ErrMsg, IfSerialNoBlocked, InstallDetFound, InstallationDet)  'this receive data from database and send back to us as json string
                           
context.Response.Write(ResponseStr) 'this is received by my app as json string

context.Response.AddHeader("PartyName", "Suruchi")  'this is not received