Caching POST data with Varnish
summary
Caches POST search requests for repeatable AJAX Views and Drupal Commerce flows by installing Varnish 5 (unstable) and compiling the body_access module, then adding a few VCL lines to include method and body data in the hash (grabs ~10–100KB). Works by differentiating GET vs POST on identical URLs and hashing body or a custom header; corner cases include collisions if relying only on Content-Length. Recommended fix: add a client-side MD5 or unique header and include it in the hash so cached responses match the exact POST payload.
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