A reference for the errors that stop Yandex processing an RSS or content feed, with causes and fixes.
The frequent ones
- Invalid XML — an unescaped ampersand is the classic.
- Wrong encoding declaration.
- Missing required elements.
- The feed unreachable or returning the wrong content type.
Prevention
Validate on generation. Feed errors are silent: the feed is accepted and nothing appears.
Alien Road
How we apply this
We validate feeds in the deployment pipeline for publisher clients. Feed problems surface as “the feature stopped working” weeks later, and by then nobody remembers what changed.
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