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Ryan Herbert authored
Cached items are causing issues after updates, since the server sometimes expects new elements in requests which the client-side files are not yet able to provide (due to caching conserving older versions of ressources). Altering the caching policy to must-revalidate forces the client's browser to check with our server whether a file has changed, allowing nginx to respond with code "304 Not Modified" when appropriate, and serving the new versions of outdated ressources correctly. See #2498
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