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Ran 18 Sep 2026 10:15AM UTC

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Build # 35333720220

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push

github

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web-flow

Commit Message

Answer a DELETE whose body holds invalid bytes instead of raising (#2954)

A DELETE that sets no status answers 204 when its body is blank, and
default_status asks with ActiveSupport's String#blank?, which matches a
regexp. Matching a regexp against a String whose bytes are not valid in its
encoding raises ArgumentError, so such a body crashed the request before
the formatter ever saw it.

It takes little to get one. Path params are tagged UTF-8 without being
checked, so `delete(':name') { "deleted #{params[:name]}" }` hands a
request for `/caf%C3%A` a String holding half a character; reading a
binary file with the default external encoding does the same.

A String like that is never blank -- an invalid byte is not whitespace --
so default_status now says so before asking blank?, and the DELETE answers
200 with its body, as it does for any other.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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