{"record":{"id":"0e9516e8fff0fbd4","repo":"sveltejs/kit","slug":"failed-to-initialize-sveltekit-cache","errorCode":null,"errorMessage":"Failed to initialize SvelteKit cache:","messagePattern":"Failed to initialize SvelteKit cache:","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"packages/kit/src/runtime/client/remote-functions/prerender.svelte.js","lineNumber":29,"sourceCode":"// Initialize Cache API for prerender functions\nconst CACHE_NAME = __SVELTEKIT_DEV__ ? `sveltekit:${Date.now()}` : `sveltekit:${version}`;\n/** @type {Cache | undefined} */\nlet prerender_cache;\n\nconst prerender_cache_ready = (async () => {\n\tif (typeof caches !== 'undefined') {\n\t\ttry {\n\t\t\tprerender_cache = await caches.open(CACHE_NAME);\n\n\t\t\t// Clean up old cache versions\n\t\t\tconst cache_names = await caches.keys();\n\t\t\tfor (const cache_name of cache_names) {\n\t\t\t\tif (cache_name.startsWith('sveltekit:') && cache_name !== CACHE_NAME) {\n\t\t\t\t\tawait caches.delete(cache_name);\n\t\t\t\t}\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tconsole.warn('Failed to initialize SvelteKit cache:', error);\n\t\t}\n\t}\n})();\n\n/**\n * @param {string} url\n * @param {string} encoded\n */\nfunction put(url, encoded) {\n\treturn /** @type {Cache} */ (prerender_cache)\n\t\t.put(\n\t\t\turl,\n\t\t\t// We need to create a new response because the original response is already consumed\n\t\t\tnew Response(encoded, {\n\t\t\t\theaders: {\n\t\t\t\t\t'Content-Type': 'application/json'\n\t\t\t\t}\n\t\t\t})","sourceCodeStart":11,"sourceCodeEnd":47,"githubUrl":"https://github.com/sveltejs/kit/blob/03f1687fe612ce3d2d9131139b5b188d9cf90c64/packages/kit/src/runtime/client/remote-functions/prerender.svelte.js#L11-L47","documentation":"The client-side remote-function prerender module initializes a Cache Storage bucket ('sveltekit:' caches) in an IIFE; if any Cache API operation fails, it logs 'Failed to initialize SvelteKit cache:' with the error via console.warn and continues without caching. This can happen in browsers/environments where caches or Cache API operations are unavailable or fail (private mode, storage quota, non-secure context).","triggerScenarios":"Loading a SvelteKit app using remote functions/prerendered data caching in a browser context where window.caches is missing, Cache Storage access is blocked, or caches.delete/open throws (Safari private browsing, embedded webviews, quota errors).","commonSituations":"Testing in private/incognito mode, in a non-HTTPS origin (cache API requires secure context), or in webviews with storage disabled; users see the warning in console but the app still works, just without the cache.","solutions":["Serve the app over HTTPS (or localhost) so the Cache API is available.","Disable private-browsing/site-data blocking for the origin during testing.","Ignore the warning if caching is non-essential — the app degrades gracefully."],"exampleFix":null,"handlingStrategy":"fallback","validationCode":"// detect Cache API availability before relying on cached remote data\nif (typeof caches === 'undefined' || !('open' in caches)) {\n  console.info('Cache Storage unavailable — running uncached');\n}","typeGuard":"const cache_api_available = () =>\n  typeof window !== 'undefined' && 'caches' in window && window.isSecureContext;","tryCatchPattern":"try {\n  const cache = await caches.open('sveltekit:my-data');\n} catch (error) {\n  console.warn('Cache unavailable, continuing without cache:', error);\n}","preventionTips":["Test the app over HTTPS or localhost; Cache Storage requires a secure context.","Expect degraded caching in private/incognito browsing and webviews — treat the warning as informational.","Do not build features that hard-depend on Cache Storage succeeding."],"tags":["cache","browser","cache-storage","console"],"backgroundTag":"cache-storage-unavailable","analyzedSha":"03f1687fe612ce3d2d9131139b5b188d9cf90c64","analyzedAt":"2026-09-02T02:01:50.504Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T06:17:21.866Z"}