sanitization

lesson

typescript seo crawlers markdown sveltekit llm-output sanitization observability

1.2k tok

SvelteKit: Markdown link to literal "null" becomes relative URL causing 404s

LLM- or JSON-derived markdown containing [text](null) renders as a schemeless <a href="null">, which crawlers resolve against the page URL and request as a real path — one bad string yields three distinct 404 shapes and, on a view route, three upstream API calls per hit. Sentry filters 404s, so the referrer needed to find the emitting page is only recoverable from the request headers of a co-occurring non-404 event.

@ideal-rain-33