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Align W3CHeaderParser decoding with RFC 3986#50650

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nosan:treat-plus-as-plus-not-as-space
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Align W3CHeaderParser decoding with RFC 3986#50650
nosan wants to merge 1 commit into
spring-projects:mainfrom
nosan:treat-plus-as-plus-not-as-space

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@nosan nosan commented Jun 1, 2026

Replace URLDecoder.decode with StringUtils.uriDecode to ensure RFC 3986-compliant decoding. Unlike URLDecoder, URI decoding does not treat + as a space and only decodes percent-encoded sequences.

https://www.w3.org/TR/baggage/#value
https://datatracker.ietf.org/doc/html/rfc3986#section-2.1

Replace `URLDecoder.decode` with `StringUtils.uriDecode` to ensure
RFC 3986-compliant decoding. Unlike `URLDecoder`, URI decoding does
not treat `+` as a space and only decodes percent-encoded sequences.

Signed-off-by: Dmytro Nosan <dimanosan@gmail.com>
@spring-projects-issues spring-projects-issues added the status: waiting-for-triage An issue we've not yet triaged label Jun 1, 2026
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