Thijs Feryn

HTTP headers that make your website go faster

Imagine serving content instantly while fetching a fresh version in the background. Discover how modern caching headers can eliminate wait times for your users.

HTTP headers that make your website go faster
#1about 5 minutes

Why reverse caching proxies are essential for performance

A reverse caching proxy sits between users and your origin server to protect it from overload and accelerate content delivery.

#2about 5 minutes

Understanding the basic Cache-Control header directives

The Cache-Control header uses directives like public, private, and max-age to define caching scope and duration for browsers and shared caches.

#3about 2 minutes

Using s-maxage to set different cache durations

The s-maxage directive allows you to set a specific time-to-live (TTL) for shared caches, which overrides the general max-age directive.

#4about 5 minutes

Optimizing revalidation with conditional requests

Use ETag and Last-Modified headers to enable conditional requests, allowing servers to respond with a 304 Not Modified to save bandwidth and resources.

#5about 3 minutes

Improving resilience by serving stale content

The stale-while-revalidate and stale-if-error directives allow caches to serve stale content while revalidating in the background or during origin failures.

#6about 3 minutes

Controlling strictness and preventing caching

Use directives like must-revalidate, no-cache, and no-store to enforce strict content freshness or prevent caching altogether for sensitive data.

#7about 2 minutes

Using the Vary header for content negotiation

The Vary header instructs caches to store different versions of a resource based on request headers like Accept-Language, enabling content negotiation.

#8about 2 minutes

Controlling multi-tier caches with surrogate headers

Surrogate-Control and Surrogate-Capability headers provide granular control over multi-tier caches and enable advanced edge computing features.

#9about 3 minutes

Composing pages at the edge with Edge Side Includes

Edge Side Includes (ESI) allow you to assemble web pages from different fragments at the cache layer, each with its own caching policy.

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