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October 3, 2025Sergei Solod5 min read

Yandex Crawled My Blog Without /en. 308 Redirects Kept the URLs Alive

After I added about 3,000 /en/blog/... pages to a sitemap, I saw Yandex try the corresponding /blog/... paths. Existing 308 redirects kept those requests from becoming 404s. The useful lesson was not that Yandex “broke” my sitemap, but how much resilience a clean redirect layer can add.

SEOYandexSitemap308 RedirectTechnical SEOCrawling

I rolled out a sitemap update with roughly 3,000 new pages under /en/blog/.... Soon after, Yandex Webmaster showed an unexpected pattern: Yandex was trying to crawl matching paths under /blog/..., without the /en prefix.

If those URLs had simply returned 404, I could have ended up with thousands of useless crawl attempts hitting dead paths. Fortunately, I had already configured permanent 308 redirects from the prefix-less routes to the real English URLs.

That small piece of defensive routing turned out to be much more valuable than I expected.

What I actually observed

The factual sequence is simple:

  1. I published a sitemap update containing about 3,000 new pages using the /en/blog/... structure.
  2. Yandex Webmaster then showed Yandex trying to crawl corresponding /blog/... URLs.
  3. Those alternate paths were already covered by 308 redirects.
  4. Instead of ending at 404 pages, requests to those paths were sent to the intended /en/blog/... URLs.

There is one important correction to the way I originally described this incident: I cannot prove that Yandex “parsed the sitemap incorrectly.” I observed the wrong-looking crawl paths after the sitemap update, but that timing alone does not establish the internal cause. Search engines can discover URLs through multiple signals and historical sources. Without stronger evidence, the accurate statement is simply that Yandex crawled paths I did not expect.

That distinction matters. A crawler requesting a strange URL is an observation. Explaining exactly why it requested that URL is a separate claim.

Why the 308 redirects mattered

My redirect logic effectively treated the shorter path as a permanent alias for the localized one. In simplified form:

/blog/example-post  -> 308 ->  /en/blog/example-post

So a crawler that requested the unexpected URL still reached the page I actually wanted to serve.

A 308 Permanent Redirect is a permanent HTTP redirect that preserves the request method and body. For ordinary crawler GET requests, method preservation is usually not the interesting part; the useful property here is that the redirect is explicitly permanent. Yandex's own Webmaster documentation currently classifies both 301 and 308 as permanent redirects.

Official Yandex Webmaster documentation on redirects.

This does not mean that 308 is automatically better than 301 for SEO. In this case, I already had 308s in place and they did the job I needed: an unintended URL did not become a dead end.

A redirect is a safety net, not a sitemap fix

The redirects contained the damage, but they did not make the unexpected crawl behavior desirable. Every unnecessary redirect still costs an extra request and an extra hop. A broad redirect rule can also hide mistakes in URL generation if you stop checking the source of the bad URLs.

If your sitemap itself contains obsolete or redirecting URLs, the right fix is to correct the sitemap and point it at the final URLs. Redirects should protect old, alternate, or accidentally discovered paths; they should not become an excuse to publish sloppy URL data.

In my case, the sitemap entries were already using /en/blog/.... The redirects simply made the site more tolerant when a crawler arrived through /blog/....

What I would verify after an incident like this

This case changed the way I think about URL migrations and localization. My practical checklist now is:

  1. Inspect the generated sitemap itself. Do not trust the code that produced it; open the deployed file and sample the actual URLs.
  2. Check final responses. Sitemap URLs that are meant to be indexed should normally resolve directly to the intended page rather than through avoidable redirect chains.
  3. Test predictable alternate paths. If an old or prefix-less URL has a legitimate permanent destination, make the mapping one-to-one and explicit.
  4. Avoid redirect chains. A -> B -> C is harder to reason about than A -> C.
  5. Compare crawler reports with server-side evidence when possible. Webmaster tools are useful, but they do not always tell you where a URL was originally discovered.
  6. Do not infer ranking impact from crawl behavior alone. Crawling, indexing, ranking, and traffic are different stages.

A minimal check for an alternate path can be as simple as:

curl -I https://example.com/blog/example-post

HTTP/2 308
location: https://example.com/en/blog/example-post

The example is illustrative, but the principle is the same: verify the exact status and exact destination instead of assuming the routing rule works.

What I can conclude, and what I cannot

I can confirm that proactive 308 redirects prevented the unexpected /blog/... requests from terminating as 404s and sent them to the intended URLs.

I cannot confirm that Yandex's sitemap parser caused those requests. I also did not measure a ranking gain, an indexing gain, or a specific amount of traffic “saved” by the redirects. Claiming any of those would be stronger than the evidence I have.

The lesson I kept is narrower and, I think, more useful: URL architecture should tolerate predictable mistakes at its boundaries. A clean sitemap is still the first line of defense. A precise permanent redirect layer is the second.

When both are present, an unexpected crawler path is much less likely to turn into thousands of dead URLs.