Chrome升級53.0.2785.116 ReportViewer匯出PDF報表錯誤

有使用ReportViewer匯出PDF報表的注意了

Chrome更新53.0.2785.116版本之後
利用ReportViewer把匯出PDF報表功能寫在Button內
會發生錯誤

Dim warnings As Warning()
Dim streamids As String()
Dim mimeType As String
Dim encoding As String
Dim extension As String

Dim bytes As Byte() = ReportViewer1.LocalReport.Render("Pdf", Nothing, mimeType, encoding, extension, streamids, warnings)

Response.Clear()
Response.AddHeader("Content-Disposition", "attachment; filename=BTrip-" & GridView1.SelectedValue & ".pdf")
Response.AddHeader("Accept-Header", reportBytes.Length.ToString())
Response.ContentType = "application/octet-stream"
Response.OutputStream.Write(bytes, 0, bytes.Length)

把匯出程式寫在Button，利用ReportViewer匯出PDF網路上很多人寫過，如果你COPY到的程式是下面這行，USER剛好又使用Chrome 53.0.2785.116下載時就會發生錯誤。

Response.AddHeader("Accept-Header", reportBytes.Length.ToString())

實測發現把上面程式碼改成下面這行就可以正常下載了。

Response.AddHeader("Content-Length", reportBytes.Length.ToString())