AspNetCore.Docs/aspnetcore/includes/response-caching-mid.md

The Response caching middleware:

• Enables caching server responses based on HTTP cache headers. Implements the standard HTTP caching semantics. Caches based on HTTP cache headers like proxies do.
• Is typically not beneficial for UI apps such as Razor Pages because browsers generally set request headers that prevent caching. Output caching, which is available in ASP.NET Core 7.0 and later, benefits UI apps. With output caching, configuration decides what should be cached independently of HTTP headers.
• May be beneficial for public GET or HEAD API requests from clients where the Conditions for caching are met.

To test response caching, use Fiddler, Postman, or another tool that can explicitly set request headers. Setting headers explicitly is preferred for testing caching. For more information, see Troubleshooting.