HTTP Keep-Alive Header Sent Whenever ASP Buffering is Enabled

ID: Q238210

The information in this article applies to:

Microsoft Internet Information Server 4.0
Microsoft Internet Information Services version 5.0

SYMPTOMS

Whenever ASP Buffering is enabled, either through the Microsoft Management Console (MMC) or programmatically in the Active Server Pages (ASP) page (response.buffer=true), an HTTP Keep-Alive header will be sent along with the Content-Length.

CAUSE

This is by design.

WORKAROUND

The header can be disabled by adding the following code to the top of the ASP pages:


<%response.flush%>

MORE INFORMATION

This behavior occurs even if Keep-Alives are disabled in the MMC. The Keep-Alive will be ignored by HTTP 1.0 (browser) clients. HTTP 1.0 Proxies will require the Content-Length header to also be present. This is transmitted by default but could be modified by an Internet server application programming interface (ISAPI) filter. If a filter is used and the Content-Length is not sent, then you will have to implement the workaround described above.

Additional query words: Keep-Alive, IIS, Header, ISAPI, Content-Length, keep alive, content length

Keywords :
Version : winnt:4.0,5.0
Platform : winnt
Issue type : kbprb