drupal-dynamic-cache

Drupal handles authenticated caching by using the Dynamic Page Cache module alongside BigPipe to store page fragments and substitute per-user data via placeholders, ensuring logged-in pages remain fast without cross-user data leakage.

UNCACHEABLE responses in Drupal authenticated page caching occur when cacheability metadata is missing or invalid, requiring proper cache contexts, tags, and max-age headers to allow the Dynamic Page Cache to safely store and serve the content.

Use lazy builders to cache personalized Drupal content by replacing per-user data with placeholders in the cached page, which are then rendered dynamically during BigPipe streaming without breaking the overall page cache.

BigPipe streaming works with the Drupal Dynamic Page Cache by progressively rendering personalized placeholders, allowing authenticated pages to send a cached shell immediately while per-user content streams in afterward.

You need per-user cache contexts for Drupal dynamic caching whenever page content varies by individual user sessions, ensuring placeholders and cacheability headers safely isolate personalized data from the shared cached page response.

The best way to debug BigPipe placeholder behavior in Drupal is to analyze cacheability headers and trace lazy builder outputs, verifying that authenticated page caching properly streams personalized placeholders without degrading performance.