What does the HTTP Caching Header Builder do?

You pick a resource type and caching options, and it generates the correct Cache-Control header plus ready-to-use Nginx, Apache, and Express.js configuration snippets.

What is the difference between max-age and s-maxage?

max-age controls how long browsers cache a response; s-maxage overrides it for shared caches like CDNs.

When should I use immutable?

Use immutable for versioned static assets (files with a hash in the name) that will never change, so browsers skip revalidation for a year.

Yes, it is free and needs no signup.

HTTP Caching Header Builder

Choose a resource type, tune the directives, and copy the resulting Cache-Control header plus server snippets.

Resource type

Directives

max-age (seconds): 0

s-maxage (seconds, 0 = off): 0

Visibility

public

private

no-store

Revalidation

no-cache

must-revalidate

immutable

ETag (optional)

HTTP Caching Header Builder

Resource type

Directives

Generated header

Server snippets

HTTP Caching Header Builder

Resource type

Directives

Generated header

Server snippets

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