cache problem in asp.net

Question

I'm seeing an issue of some static pages that are using the browser cache, which is not desired. To prevent caching, I'm setting

<clientCache cacheControlMode="DisableCache" />

in the relevant <location> tag in web.config

If I open the page in Firebug (in the Net tab), I see that the Response headers have Cache-Control: no-cache which is correct, but the status of the Response is 304 Not Modified! Isn't that a contradiction? How can I get it to stop caching (i.e. always send a 200 with content)?

A better question might be... "Why doesn't IIS think the file it has is newer?" If you could fix that then you won't need to take the performance hit by turning off caching. — David
– David, Commented Jun 7, 2010 at 19:26

JoelFan · Accepted Answer · 2010-06-07 20:43:11Z

5

According to the RFC (http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.1, section 14.9.1) Cache-control: no-cache tells the browser to not use the cached contents without first revalidating with the server. That's why you're seeing the 304's. I think you're looking for Cache-Control: no-store.

I'm not sure if you can send no-store via a configuration file. You can, however, set the header explicitly in the response:

Response.Cache.SetNoStore();

EDIT: (by OP)

What I was looking for was:

<clientCache cacheControlCustom="no-store" />

edited Jun 7, 2010 at 20:43

JoelFan

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answered Jun 7, 2010 at 19:08

Paul Kearney - pk

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5 Comments

JoelFan Over a year ago

But I am trying to accomplish this in web.config, not in code. Is there a better option than <clientCache cacheControlMode="DisableCache" /> ?

Paul Kearney - pk Over a year ago

Try this (untested!): <clientCache cacheControlCustom="no-store" />

JoelFan Over a year ago

This page iis.net/ConfigReference/system.webServer/staticContent/… does not list "no-store" as a possible setting

Paul Kearney - pk Over a year ago

But it does say that it's list is not comprehensive, and gives a reference to RFC 2616 (see my link above). You can use cacheControlCustom to set the cache-control header to any custom value, in this case "no-store", which is valid per the RFC.

JoelFan Over a year ago

@PK, oops! I didn't read your earlier comment carefully enough to see that you used a different attribute (cacheControlCustom instead of cacheControlMode)

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