This may be the .Net version of this question.

I have an image script with the following:

...
Response.WriteFile(filename);
Response.End();

I am rewriting .jpg files using the following rewrite rule in web.config:

<rule name="Image Redirect" stopProcessing="true">
  <match url="^product-images/(.*).jpg" />
  <conditions>
    <add input="{REQUEST_URI}" pattern="\.(jp?g|JP?G)$" />
  </conditions>
  <action type="Redirect" redirectType="SeeOther" url="/product-images/ProductImage.aspx?path=product-images/{tolower:{R:1}}.jpg" />
</rule>

It basically just rewrites the image path into a query parameter.

The problem is that (intermittently of course) Mosso returns a new Asp Session cookie which breaks the whole world.

• Directly accessing a static .jpg file does not cause this problem.
• Directly accessing the image script does not cause it either.
• Only rewriting a .jpg file to the .aspx script causes the Session loss.

Things I have tried

(From the Rackspace doc How can I bypass the cache?)

I added Private cacheability to the image script itself:

Response.Cache.SetCacheability(HttpCacheability.Private);

I tried adding these cache-disabling nodes to web.config:

<staticContent>
  <clientCache cacheControlMode="DisableCache" />
</staticContent>

and

<httpProtocol>
  <customHeaders>
    <add name="Cache-Control private" value="Cache-Control private"
  </customHeaders>
</httpProtocol> 

The Solution I need

The browser cache cannot be disabled. This means potential solutions involving Cache.SetNoStore() or HttpCacheability.NoCache will not work.