IIS7 Cache-Control

Question

I m trying to do something which I thought would be fairly simple   Get IIS 7 to tell clients they can cache all images on my site for a certain amount of time  let s say 24 hours     I have tried the step on http   www galcho com Blog post 2008 02 27 IIS7-How-to-set-cache-control-for-static-content aspx but to no avail  I still get requests going to the server with 304s being returned     Does anyone have a way of doing this   I have a graphically intensive site and my users are being hammered  so is my server  every time they request a page   Wierdly the images seem to have  Cache-Control private max-age 3600  showing up in Firebug but the browser is still requesting them when I press F5

User · Answer

I use this   lt staticContent gt   lt clientCache cacheControlCustom  public  cacheControlMode  UseMaxAge  cacheControlMaxAge  500 00 00 00    gt   lt  staticContent gt    to cache static content for 500 days with public cache-control header

User · Answer

That s not true Jeff   You simply have to select a folder within your IIS 7 Manager UI  e g  Images or event the Default Web Application folder  and then click on  HTTP Response Headers   Then you have to click on  Set Common Header    in the right pane and select the  Expire Web content   There you can easily configure a max-age of 24 hours by choosing  After    entering  24  in the Textbox and choose  Hours  in the combobox   Your first paragraph regarding the web config entry is right  I d add the cacheControlCustom-attribute to set the cache control header to  public  or whatever is needed in that case   You can  of course  achieve the same by providing web config entries  or files  as needed   Edit  removed a confusing sentence

User · Answer

Complementing Elmer s answer  as my edit was rolled back    To cache static content for 365 days with public cache-control header  IIS can be configured with the following    lt staticContent gt       lt clientCache cacheControlCustom  public  cacheControlMode  UseMaxAge  cacheControlMaxAge  365 00 00 00    gt   lt  staticContent gt    This will translate into a header like this   Cache-Control  public max-age 31536000   Note that max-age is a delta in seconds  being expressed by a positive 32bit integer as stated in RFC 2616 Sections 14 9 3 and 14 9 4  This represents a maximum value of 2 31 or 2 147 483 648 seconds  over 68 years   However  to better ensure compatibility between clients and servers  we adopt a recommended maximum of 365 days  one year    As mentioned on other answers  you can use these directives also on the web config of your site for all static content  As an alternative  you can use it only for contents in a specific location too  on the sample  30 days public cache for contents in  cdn  folder     lt location path  cdn  gt      lt system webServer gt           lt staticContent gt                lt clientCache cacheControlCustom  public  cacheControlMode  UseMaxAge  cacheControlMaxAge  30 00 00 00   gt           lt  staticContent gt      lt  system webServer gt   lt  location gt

User · Answer

there is a easy way  1  using website s web config 2  in  staticContent  section remove specific fileExtension  and add mimeMap 3  add  clientCache    lt configuration gt     lt system webServer gt       lt urlCompression doStaticCompression  true  doDynamicCompression  true    gt       lt staticContent gt         lt remove fileExtension   ipa    gt         lt remove fileExtension   apk    gt         lt mimeMap fileExtension   ipa  mimeType  application iphone    gt         lt mimeMap fileExtension   apk  mimeType  application vnd android package-archive    gt         lt clientCache cacheControlMode  UseMaxAge  cacheControlMaxAge  777 00 00 00    gt       lt  staticContent gt     lt  system webServer gt   lt  configuration gt

User · Answer

If you want to set the Cache-Control header  there s nothing in the IIS7 UI to do this  sadly   You can however drop this web config in the root of the folder or site where you want to set it    lt  xml version  1 0  encoding  UTF-8   gt   lt configuration gt     lt system webServer gt       lt staticContent gt         lt clientCache cacheControlMode  UseMaxAge  cacheControlMaxAge  7 00 00 00    gt       lt  staticContent gt     lt  system webServer gt   lt  configuration gt    That will inform the client to cache content for 7 days in that folder and all subfolders    You can also do this by editing the IIS7 metabase via appcmd exe  like so     Windows system32 inetsrv appcmd exe    set config  Default Web Site folder     -section system webServer staticContent    -clientCache cacheControlMode UseMaxAge   Windows system32 inetsrv appcmd exe    set config  Default Web Site folder     -section system webServer staticContent    -clientCache cacheControlMaxAge  7 00 00 00

User · Answer

The F5 Refresh has the semantic of  please reload the current HTML  AND its direct dependancies    Hence you should expect to see any imgs  css and js resource directly referenced by the HTML also being refetched   Of course a 304 is an acceptable response to this but F5 refresh implies that the browser will make the request rather than rely on fresh cache content   Instead try simply navigating somewhere else and then navigating back   You can force the refresh  past a 304  by holding ctrl while pressing f5 in most browsers

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