Is Dynamic CSS causing caching issues?

I have implemented an HttpHandler to dynamically adjust CSS (specifically colors) based on a technique I discovered on SO.

Everything is working perfectly, except for the page where users can customize their own colors. When they save their preferences and the page refreshes, the new colors are not displayed immediately. They only appear when I manually reload the browser or press F5.

While I understand that caching by either IIS or the browser is usually beneficial, in this specific instance, I need to find a way to trigger a reload and activate the HttpHandler.

Does anyone know how to achieve this?

Here are some methods I've attempted:

    Response.Clear();
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.Expires = -1;
    Response.Cache.SetExpires(DateTime.Now.AddDays(-1));

Due to my use of ASP.NET themes, adding a querystring to the stylesheet link isn't straightforward.

Any suggestions?

c#asp.netcsscachinghttphandler

Answer №1

I have a special technique that I apply to my websites in order to trigger asset reloads after they have been changed, like following a deployment.

To achieve this, you can add ?value at the end of your CSS URL, where value represents the version or any unique identifier that the browser has not encountered before. In my scenario, I utilize the file's modification time for this purpose. However, if your CSS content changes frequently with each page load, it would be recommended to generate a distinct value dynamically.

By ensuring that the URL varies every time, the browser will consistently reload the asset without storing it in its cache.

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