fix(html): detect redirect loops at build time#3103
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Reject `[output.html.redirect]` configurations that form a cycle before emitting redirect pages, with an error message showing the loop. Fixes rust-lang#2901. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
Detects cycles in
[output.html.redirect]during the HTML build and fails with a clear error instead of generating redirect pages that reload indefinitely in the browser.Example error:
External destinations (
http://,https://,//) terminate the chain and are not treated as redirect sources.Fixes #2901.
Test plan
redirects/redirect_looptestsuite casecargo test -p mdbook --test testsuite(111 passed)Made with Cursor