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DEV.to Fixes Long-Standing CSS Cache Mismatch Bug in Its Hybrid SPA Architecture

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DEV.to, powered by the open-source Forem codebase, has shipped a fix (PR #23789) addressing a persistent CSS caching mismatch that has plagued the platform since its early days. The issue arose from its hybrid setup combining Rails server rendering, Fastly edge caching, and InstantClick-based partial page swaps, where cached article pages could reference outdated stylesheet versions after a new deployment. Previous client-side workarounds were brittle and caused broken layouts, 404 errors on pruned assets, and flashes of unstyled content. The new solution reframes the problem as cache partitioning rather than DOM manipulation, using a 10-character fingerprint derived from combined stylesheet digests and appending it as a query parameter to internal navigation requests. This allows Fastly to naturally serve cache-partitioned responses that match the active stylesheet version, reducing — though not entirely eliminating — the mismatch problem.

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