Response Caching Middleware — Config Cache-Control max-age per Content-Type

[ghost]

How, with Response Caching in Middleware, can we configure:

• Cache-Control 's max-age per Content-Type?
• Override cache policy by Location?

With Microsoft.AspNetCore.Builder.StaticFileOptions, we can use if/else/switch, but how to do the same thing with Microsoft.Net.Http.Headers.CacheControlHeaderValue()

[Tratcher]

@JunTaoLuo

[JunTaoLuo]

We don't currently have any functionality like StaticFileOptions's OnPrepareResponse where you can directly modify the response that's being sent by the middleware. This feature is tracked in #2618.

However, you can achieve a similar effect by setting the Vary header to "Content-Type, Location" and storing multiple responses. See https://docs.microsoft.com/en-us/aspnet/core/performance/caching/middleware?view=aspnetcore-2.1#http-headers-used-by-response-caching-middleware for an explanation.

[ghost]

@JunTaoLuo

However, you can achieve a similar effect by setting the Vary header to "Content-Type, Location" and storing multiple responses.

Similar effect? Can you show me how to store multiple responses with different MaxAge?

[JunTaoLuo]

Ah, I mis-spoke. The Vary header will only allow the storing of multiple responses for different values of Request headers. However, in your scenario, you want to set different max-age based on the Content-Type of the Response right? That's not possible at the moment and the feature in the previous link would need to be implemented to enable this. The same goes for Location. The functionality of the response cache middleware is currently very limited so you may need to set the appropriate headers and rely on the caching performed by the browser and intermediaries like proxies.

[ghost]

Ok thanks!