{"record":{"id":"a0934eef7dd0b13b","repo":"gatsbyjs/gatsby","slug":"html-body-h1-404-h1-p-not-found-p-body-h","errorCode":null,"errorMessage":"

404

Not found

","messagePattern":"

404

Not found

","errorType":"http","errorClass":null,"httpStatus":404,"severity":"error","filePath":"packages/gatsby/src/utils/page-ssr-module/lambda.ts","lineNumber":507,"sourceCode":" req: GatsbyFunctionRequest,\n res: GatsbyFunctionResponse\n): Promise {\n try {\n let pageInfo: IPageInfo | undefined\n\n const originalPathName = req.url ?? ``\n\n if (PATH_PREFIX && originalPathName.startsWith(PATH_PREFIX)) {\n const maybePath = originalPathName.slice(PATH_PREFIX.length)\n pageInfo = getPage(maybePath)\n }\n\n if (!pageInfo) {\n pageInfo = getPage(originalPathName)\n }\n\n if (!pageInfo) {\n res.status(404).send(getErrorBody(404))\n return\n }\n\n const { pagePath, isPageData, page } = pageInfo\n\n const data = await getData({\n pathName: pagePath,\n getGraphqlEngine: () =>\n memoizedInitializeGraphqlEngine(\n req?.rawUrl ? new URL(req.rawUrl).origin : cdnDatastoreOrigin\n ),\n req,\n })\n\n if (isPageData) {\n const results = await renderPageData({ data })\n setStatusAndHeaders({ page, data, res })\n res.json(results)","sourceCodeStart":489,"sourceCodeEnd":525,"githubUrl":"https://github.com/gatsbyjs/gatsby/blob/8cffb8f412653a717042ec4de85038b4f2edd5e8/packages/gatsby/src/utils/page-ssr-module/lambda.ts#L489-L525","documentation":"engineHandler resolves the request path against the page manifest (honoring PATH_PREFIX); no matching page or page-data route yields this HTML 404 body sent with status 404. It is the SSR engine's terminal response for unknown routes, not an exception.","triggerScenarios":"Thrown at packages/gatsby/src/utils/page-ssr-module/lambda.ts:489 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Create a page (or 404 page) for the requested route","Check pathPrefix configuration if routes are missing their prefix","Verify the routes manifest includes the path"],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"8cffb8f412653a717042ec4de85038b4f2edd5e8","analyzedAt":"2026-08-26T17:50:09.662Z","contentChangedAt":"2026-08-26T17:50:09.662Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}