CODEWITHSUNDEEP
asp.netbrowser-cachecache-control
CSC
CSC

Reputation: 1245

Browser cache not expiring

I am developing my application in asp.net and wanted force refreshing of .js files after certain period of time. In order to test that in local environment, I made following change to my web.config file:

<httpProtocol>
  <customHeaders>
    <add name="Cache-Control" value="must-revalidate max-age=120" />
  </customHeaders>
</httpProtocol>

As I understand cache-control, based on above settings, browser cache should expire after 2:00 minutes and any new postback should send a request to webserver to check if newer version of .js is avialable or not. I used fiddler to monitor network traffic and I don't see any request for js file. The browser I am using is Chrome. So I used dev tools to monitor network traffic. I see that the browser is using cached version of that file.

Are there any other settings that would force the browser to expire the cached files?

Upvotes: 0

Views: 101

Answers (1)

Lionia Vasilev
Lionia Vasilev

Reputation: 12748

Your Cache-Control is invalid, try separate values by comma: must-revalidate, max-age=120.

Relevant excerpt from RFC 7234 Hypertext Transfer Protocol (HTTP/1.1): Caching:

Cache-Control = 1#cache-directive

cache-directive = token [ "=" ( token / quoted-string ) ]

And ABNF List Extension from RFC 7230 Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing:

A construct "#" is defined, similar to "*", for defining comma-delimited lists of elements. The full form is "<n>#<m>element" indicating at least <n> and at most <m> elements, each separated by a single comma (",") and optional whitespace (OWS).

Also make sure to put new configuration in right place. For more information check Is it possible to add response http headers in web.config?.

Upvotes: 1

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