Purge Uncacheable Tags Headers
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This module ensures that cache tags and headers are added to responses that are not normally cacheable by Drupal. This is helpful when an upstream cache system handles caching decisions or for requests like GraphQL POST requests that Drupal itself cannot cache.
By default the request event listener of the purge module will only add tags headers to cacheable responses. This module adds the tags headers from purge plugins to uncacheable requests as well.
This can be useful if the caching decision is handled (or overridden) in an upstream shared cache. Other use cases include graphql requests that use a POST method and thus are not cacheable by Drupal.