哪种 ContentType 用于流式文件以在浏览器中查看？

Question

我正在尝试使用 adodb 将文件流式传输到浏览器。

用户得到这样的选项：

Save File 选项按预期工作。

但是 Open with Firefox 选项给出了 gobbledy，并且 .htm 被附加到文件名的末尾。

我推测这与 Response.ContentType 的设置有关。

我试过使用 application/pdf、application/octet-stream 和 application/x-unknown。但无论我使用哪个，我总是得到相同的结果。

这是怎么回事？我应该使用什么 ContentType？

使用 Firefox 打开的截图

ADODB 流代码

Dim objStream
Set objStream = Server.CreateObject("ADODB.Stream")
objStream.Type = 1 
objStream.Open
objStream.LoadFromFile(fileDirectory & "\" & fileToDownload)

Response.AddHeader "Expires", "0"
Response.AddHeader "Content-Transfer-Encoding", "binary" 
Response.AddHeader "Content-Description", "File Transfer" 
Response.AddHeader "Content-Disposition", "attachment; filename=" & fileToDownload
Response.AddHeader "Content-Length", objStream.Size 
Response.CharSet = "UTF-8"
Response.ContentType = "???"  // *** what should I put here? ***
Response.BinaryWrite objStream.Read
objStream.Close
Set objStream = Nothing

Answer 1

除了Response.ContentType = "application/pdf"，我还需要Response.AddHeader "Content-Type", "application/pdf"。

所以最终有效的代码是：

Dim objStream
Set objStream = Server.CreateObject("ADODB.Stream")
objStream.Type = 1 'adTypeBinary
objStream.Open
objStream.LoadFromFile(fileDirectory & "\" & fileToDownload)

Response.AddHeader "Expires", "0"
Response.AddHeader "Content-Transfer-Encoding", "binary" 
Response.AddHeader "Content-Description", "File Transfer" 
Response.AddHeader "Content-Disposition", "attachment; filename=" & fileToDownload
Response.AddHeader "Content-Length", objStream.Size 
Response.AddHeader "Content-Type", "application/pdf" '** added this line **
Response.CharSet = "UTF-8"
Response.ContentType = "application/pdf"
Response.BinaryWrite objStream.Read
objStream.Close
Set objStream = Nothing

哪种 ContentType 用于流式文件以在浏览器中查看？

Which ContentType to use for streaming file to view in browser?

content-type

adodb

stream

asp-classic

mime-types