feat(rss): conditional GET (ETag/If-Modified-Since) for Railway relay#625
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When RSS cache expires, send If-None-Match/If-Modified-Since headers on revalidation. Upstream 304 responses refresh the cache timestamp and serve cached body with zero bandwidth, cutting egress ~80-95% for feeds that support conditional GET.
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koala73
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Mar 1, 2026
…lay (#625) When RSS cache expires, send If-None-Match/If-Modified-Since headers on revalidation. Upstream 304 responses refresh the cache timestamp and serve cached body with zero bandwidth, cutting egress ~80-95% for feeds that support conditional GET.
matthewvecchione1-ops
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Mar 4, 2026
…lay (koala73#625) When RSS cache expires, send If-None-Match/If-Modified-Since headers on revalidation. Upstream 304 responses refresh the cache timestamp and serve cached body with zero bandwidth, cutting egress ~80-95% for feeds that support conditional GET.
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Summary
If-None-Match/If-Modified-Sinceheaders when revalidating expired RSS cache entries in the Railway relay304 Not Modified— refresh cache timestamp and serve cached body with zero bandwidthETagandLast-Modifiedfrom upstream responses in cache entriesFiles changed
scripts/ais-relay.cjs— 3 surgical edits in RSS handler (~25 lines)scripts/ais-relay-rss.test.cjs— 2 new tests (ETag + If-Modified-Since revalidation), updated mock upstream and test proxyTest plan
node --test scripts/ais-relay-rss.test.cjs— 7/7 pass (5 existing + 2 new)node -c scripts/ais-relay.cjs— syntax OKtsc --noEmit— type check passescurl -vRSS endpoint twice after cache expiry — second should showX-Cache: REVALIDATEDfor feeds returning ETag/Last-Modified (e.g. BBC)