Try to download the online page with OkHttpUtils2:
B4X:
Dim j As HttpJob
j.Initialize("", Me)
j.Download("https://play.google.com/store/apps/details?id=anywheresoftware.b4a.b4abridge2")
Wait For (j) JobDone(j As HttpJob)
If j.Success Then
Else
If j.Response.StatusCode = 404 Then
Log("not exists")
Else
Log("other error")
End If
End If
j.Release