ASP.NET Core MVC Interview Question #142

What is output caching in ASP.NET Core?

Dependency Injection, Services, Error Handling, Logging & Performance Senior Advanced

Quick Interview Answer

Output caching is server-side middleware that can store and reuse generated responses according to configured policies. It provides application-controlled caching behavior and can reduce repeated work for suitable endpoints.

Detailed Explanation

Cache policies must account for route, query, header, authentication, and personalization differences as required. Never cache private user-specific output under a key that could be reused for another user.

Code Example

builder.Services.AddOutputCache();

app.UseOutputCache();

[OutputCache(Duration = 60)]
public IActionResult Catalog()
{
    return View();
}