How do I add no-cache to Kestrel responses?

Question

I'm using Asp.Net Core RC2 and Kestrel as my web server. I need to ensure that requests (in this case all of them) are responded to with a no-cache header so that the browsers get the newest version (not 304).

Is there a way in Startup to configure Kestrel or a way to inject this step into the pipeline?

EDIT: no-store may be a better choice in my situation: https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching "no-store Response is not allowed to be cached and must be fetched in full on every request."

N. Taylor Mullen · Accepted Answer · 2016-05-02T18:15:36.057

13

You can use middleware to work with headers. For example, you can force no-cache cache-control by adding the following to the top of your Startup's Configure method:

app.Use(async (httpContext, next) =>
{
    httpContext.Response.Headers[HeaderNames.CacheControl] = "no-cache";
    await next();
});

edited May 02 '16 at 18:15

answered May 02 '16 at 18:03

N. Taylor Mullen

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5

nit: you can use the built-in [`HeaderNames` class](https://github.com/aspnet/HttpAbstractions/blob/release/src/Microsoft.Net.Http.Headers/HeaderNames.cs) to avoid the first magic string: `httpContext.Response.Headers[HeaderNames.CacheControl] = "no-cache"`. – Kévin Chalet May 02 '16 at 18:14
1

Updated to reflect change. – N. Taylor Mullen May 02 '16 at 18:15
4

Make sure this is above other app.Uses (ex app.UseDefaultFiles or app.UseStaticFiles() – AlignedDev May 02 '16 at 20:22
1

@Aligned thank you, potentially saved me a half an hour of debugging. – René Sackers Jun 07 '17 at 19:42

How do I add no-cache to Kestrel responses?

1 Answers1