{"record":{"id":"b8102c88432976f4","repo":"withastro/astro","slug":"background-revalidation-failed-for-requesturl-pa","errorCode":null,"errorMessage":"Background revalidation failed for ${requestUrl.pathname}${requestUrl.search}: ${String(error)}","messagePattern":"Background revalidation failed for (.+?)(.+?): (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/astro/src/core/cache/memory-provider.ts","lineNumber":488,"sourceCode":"\t\t\t\t\t\t\t\t\t\treturn;\n\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\tconst newTags = parseCacheTags(freshResponse.headers.get('Cache-Tag'));\n\t\t\t\t\t\t\t\t\tconst newEntry = await serializeResponse(\n\t\t\t\t\t\t\t\t\t\tfreshResponse,\n\t\t\t\t\t\t\t\t\t\tcontext.request,\n\t\t\t\t\t\t\t\t\t\tnewMaxAge,\n\t\t\t\t\t\t\t\t\t\tnewSwr,\n\t\t\t\t\t\t\t\t\t\tnewTags,\n\t\t\t\t\t\t\t\t\t);\n\t\t\t\t\t\t\t\t\t// Update Vary map if the response changed its Vary headers\n\t\t\t\t\t\t\t\t\tif (newEntry.vary) {\n\t\t\t\t\t\t\t\t\t\tvaryMap.set(primaryKey, newEntry.vary);\n\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\tcache.set(key, newEntry);\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t})\n\t\t\t\t\t\t\t.catch((error) => {\n\t\t\t\t\t\t\t\tcontext.logger.warn(\n\t\t\t\t\t\t\t\t\t`Background revalidation failed for ${requestUrl.pathname}${requestUrl.search}: ${String(\n\t\t\t\t\t\t\t\t\t\terror,\n\t\t\t\t\t\t\t\t\t)}`,\n\t\t\t\t\t\t\t\t);\n\t\t\t\t\t\t\t});\n\n\t\t\t\t\t\tconst response = createResponseFromCacheEntry(cached);\n\t\t\t\t\t\tresponse.headers.set('X-Astro-Cache', 'STALE');\n\t\t\t\t\t\treturn response;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Past SWR window or Vary mismatch — expired, treat as miss\n\t\t\t}\n\n\t\t\t// Cache miss — render fresh\n\t\t\tconst response = await next();\n","sourceCodeStart":470,"sourceCodeEnd":506,"githubUrl":"https://github.com/withastro/astro/blob/e294953aa8aadd98d5be92e60a03037b05dbdfd4/packages/astro/src/core/cache/memory-provider.ts#L470-L506","documentation":"A stale-while-revalidate cached response was served and the provider attempted to refresh the cache entry in the background by re-fetching the original request URL. That background fetch or re-serialization threw (network failure, upstream server error, etc.). The catch block logs this warning and keeps the previously cached (stale) entry; the user-facing response is unaffected.","triggerScenarios":"Thrown at packages/astro/src/core/cache/memory-provider.ts:488 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check that the origin server and network are reachable from the server running Astro","Inspect the appended error message for the underlying cause (timeout, DNS, 5xx, etc.)","If revalidation repeatedly fails, the stale entry persists — verify the upstream route still returns valid responses"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"e294953aa8aadd98d5be92e60a03037b05dbdfd4","analyzedAt":"2026-09-09T03:35:40.650Z","contentChangedAt":"2026-09-09T03:35:40.650Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}