Sitemaps guide
How to debug a failing sitemap-index child
Trace one failing child sitemap from index entry through HTTP retrieval and document validation without rebuilding the entire sitemap set.
7 min read · Updated 2026-08-21
The short answer
Take the exact child loc from the sitemap index, fetch it without a session, follow its response chain, and validate the final body independently. Confirm it is a sitemap rather than another index, stays within the permitted site scope, and returns stable content at the URL the index publishes.Start from the published child URL
Do not substitute a storage path or internal origin. Copy the decoded loc value, request it as an anonymous crawler would, and record the final status, redirects, content type, and body root.
- The final response should be successful and contain XML, not an HTML error page.
- Redirects should not cross into authentication, bot challenges, or an unintended host.
- Compressed children must be served and encoded consistently with their URL and headers.
- A child entry points to a sitemap, not another sitemap index.
Validate the child as its own document
A perfectly valid index says nothing about whether a child has the right namespace, contains any URLs, or stays within limits. Decompress the final response when necessary and run the child through XML and sitemap validation separately.
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap><loc>https://example.com/sitemaps/products.xml</loc></sitemap>
</sitemapindex>Fix generation and invalidation together
When the child is generated correctly but crawlers still receive an old failure, purge the CDN object and verify the public response again. Publish child files before the index that references them, and remove index entries only after replacements are reachable.
Monitor child counts and status independently so one broken partition identifies itself instead of making the whole index appear unreliable.
Prove the fix
- Validate the child sitemapRun the final public response body rather than a local generated file.
- Review sitemap-index elementsInspect sitemapindex, sitemap, loc, and lastmod rules separately.
- Split a large sitemapRevisit partitioning and publish order when one child exceeds limits.
Related guides
- How to fix “Sitemap could not be read”A deterministic checklist for separating fetch failures, HTTP problems, malformed XML, namespace mistakes, and invalid sitemap entries.
- How to split a large XML sitemapDivide a sitemap before it crosses protocol limits, build a sitemap index, and choose boundaries that make failures and Search Console reports useful.
- How to use sitemap lastmod correctlyWhat <lastmod> should measure, which date forms are valid, when to omit it, and why stamping every URL on every deploy destroys the signal.
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