withastro/astro · error

Background revalidation failed for ${requestUrl.pathname}${r

Error message

Background revalidation failed for ${requestUrl.pathname}${requestUrl.search}: ${String(error)}

What it means

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.

Source

Thrown at packages/astro/src/core/cache/memory-provider.ts:488

										return;
									}
									const newTags = parseCacheTags(freshResponse.headers.get('Cache-Tag'));
									const newEntry = await serializeResponse(
										freshResponse,
										context.request,
										newMaxAge,
										newSwr,
										newTags,
									);
									// Update Vary map if the response changed its Vary headers
									if (newEntry.vary) {
										varyMap.set(primaryKey, newEntry.vary);
									}
									cache.set(key, newEntry);
								}
							})
							.catch((error) => {
								context.logger.warn(
									`Background revalidation failed for ${requestUrl.pathname}${requestUrl.search}: ${String(
										error,
									)}`,
								);
							});

						const response = createResponseFromCacheEntry(cached);
						response.headers.set('X-Astro-Cache', 'STALE');
						return response;
					}
				}

				// Past SWR window or Vary mismatch — expired, treat as miss
			}

			// Cache miss — render fresh
			const response = await next();

View on GitHub (pinned to e294953aa8)

Solutions

1. Check that the origin server and network are reachable from the server running Astro
2. Inspect the appended error message for the underlying cause (timeout, DNS, 5xx, etc.)
3. If revalidation repeatedly fails, the stale entry persists — verify the upstream route still returns valid responses

When it happens

Trigger: Thrown at packages/astro/src/core/cache/memory-provider.ts:488 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of withastro/astro@e294953aa8 (2026-09-09). Data as JSON: /api/errors/b8102c88432976f4. Report an issue: GitHub.