HTTP Cache Debugging Tools

Practical tools and commands for inspecting HTTP cache headers and debugging Drupal caching behavior.

When to Use

• Inspecting cache response headers (X-Drupal-Cache, Cache-Control, etc.)
• Verifying cache hit/miss status
• Debugging why pages aren't caching
• Testing authenticated vs anonymous caching
• Analyzing Vary headers and cache variations

SparkFabrik Project Context

For container access and service URLs in SparkFabrik projects, see the pkg-skills reference.

Quick reminder:

• Inside container: http://drupal-nginx
• From host: Use fs-cli pkg:get-urls to get external URL