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From Philip Wigg <>
Subject Re: [users@httpd] Cannot download files over SSL in Internet Explorer - where is Cache-Control: no-cache header being set?
Date Thu, 04 Mar 2010 13:53:35 GMT
> Sounds strange. Do you have anything else modifying the HTTP response
> headers in front of your web servers, for example, a load-balancer?

Just in case you have an F5 BIG-IP WebAccelerator, there is a known
issue regarding this (needs login):-

SOL9671: The BIG-IP WebAccelerator may insert an HTTP Cache-Control:
no-cache header into a response when an existing Cache-Control header
is not present

 Known Issue
Updated Date: 12/28/2009
This is the result of a known issue. The BIG-IP WebAccelerator inserts
the HTTP Cache-Control: no-cache header into a response. This behavior
occurs when the requested object matches an acceleration policy node
with client cache settings configured with the Do not change option
selected, and the response from the origin web server (OWS) does not
have an existing HTTP Cache-Control header.

Note: The BIG-IP WebAccelerator inserts the HTTP Cache-Control:
no-cache header into a response regardless of whether the Always proxy
request for this node option is selected.

When the HTTP Cache-Control: no-cache header is inserted by the BIG-IP
WebAccelerator, Internet Explorer 6 browser clients may be unable to
display objects with an external application.

Note: For information about this issue, refer to SOL9603: Microsoft
Office documents may not open or save properly when accessed through a
BIG-IP WebAccelerator using Internet Explorer 6.

Note: This behavior was introduced in Hotfix-BIG-IP-9.4.5-HF2 for
BIG-IP WebAccelerator version 9.4.5 to address caching issues with
downstream caches.



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