Odtnhj

Making my first steps on Http within VBA.
Already managed to get cookie value in order to make a request. The problem i'm having is that the file i want to download is not in the first response. When I analyse using HTTP Header Live, the browse receives several responses and only the last one is the file, a pdf that is generated after a query sent by the user. The only thing I'm getting is the first response that i'm displayng with a MsgBox. Can someone Help me solving this problem. Made some searches through the web but haven't found yet, a solution.
Thanks

The code am using is

Dim WinHttpReq As Object
Set WinHttpReq = CreateObject("WinHTTP.WinHTTPrequest.5.1")
With WinHttpReq
 .Open "POST", myURL, False ', "username", "password"
 .send
 x = .getResponseHeader("Set-Cookie")
 i = InStr(x, ";")
 x = Left(x, i - 1)
 MsgBox x
End With

With WinHttpReq
 .Open "GET", myURL, False
 .Option(WinHttpRequestOption_EnableRedirects) = True
 .SetRequestHeader "Content-Type", "application/pdf"
 .SetRequestHeader "Accept-Encoding", "gzip, deflate, br"
 .SetRequestHeader "Cookie", x
 .SetRequestHeader "User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0"
 .send
End With

MsgBox (WinHttpReq.getAllResponseHeaders())
If WinHttpReq.Status = 200 Then
 Set oStream = CreateObject("ADODB.Stream")
 With oStream
 .Type = 1
 .Open
 .Write WinHttpReq.responseBody
 .SaveToFile "C:UsersxxxDesktopfile.pdf", 2 
 .Close
 End With
End If
Set WinHttpReq = Nothing
Set oStream = Nothing
End Sub

Analysing with Firefox, when I enter the URL, i receive two responses with 200 OK. I wonder how can i get the second response? The site uses a javascript that interprets the query i send and returns a pdf file. The file name changes according to the user and the query.