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Don't assume the download worked just because the request "finished." Always verify Status = 200 . If you get a 301 or 302, you may need to enable automatic redirection. 2. Handling Large Files
Regardless of the programming language, downloading a file with WinHTTP follows a consistent five-step process: Open a session to set up the user agent. Connect: Open an HTTP request to the specific URL. Send: Dispatch the request to the server. download file using winhttp
When it comes to making HTTP requests in Windows-native environments (like C++, VBA, or VBScript), is the gold standard. Unlike its sibling WinInet , which was designed for interactive browser-like behavior, WinHTTP is built for server-side applications, services, and high-performance automation. Don't assume the download worked just because the
Sub DownloadFileWinHTTP() Dim http As Object Dim url As String Dim savePath As String Dim stream As Object url = "https://example.com" savePath = "C:\Downloads\sample.pdf" ' Create the WinHTTP Object Set http = CreateObject("WinHttp.WinHttpRequest.5.1") ' Initialize and Send Request http.Open "GET", url, False http.Send ' Check if download was successful If http.Status = 200 Then ' Use ADODB.Stream to save binary data Set stream = CreateObject("ADODB.Stream") stream.Type = 1 'adTypeBinary stream.Open stream.Write http.ResponseBody stream.SaveToFile savePath, 2 'adSaveCreateOverWrite stream.Close MsgBox "Download Complete!" Else MsgBox "Error: " & http.StatusText End If End Sub Use code with caution. Implementation 2: C++ (Native API) Handling Large Files Regardless of the programming language,
Low overhead compared to higher-level wrappers.