ASP.NET Core Interview Question #185

What is response caching and how is it different from output caching?

Performance, Caching & HTTP Senior Advanced

Quick Interview Answer

Response caching follows HTTP caching semantics and relies heavily on cache-related request and response headers. It is designed around standard HTTP caching behavior.

Detailed Explanation

Response caching follows HTTP caching semantics and relies heavily on cache-related request and response headers. It is designed around standard HTTP caching behavior.

Output caching is a server-side feature that gives the application more direct control over whether and how generated responses are stored and reused.

Both can improve performance, but they solve different caching scenarios. Developers should understand privacy, authorization, variation, and freshness before caching HTTP responses.

Code Example

builder.Services.AddResponseCaching();

var app = builder.Build();
app.UseResponseCaching();

// Output caching is separately configured with
// AddOutputCache() and UseOutputCache().