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spring-framework/spring-core
Artyom Tsvirko 2028eb3694 Handle MIME type parameter names case-insensitively
MIME type parameter names are case-insensitive, and MimeType already
stores them in a LinkedCaseInsensitiveMap. Several code paths, however,
still compared them with case-sensitive String.equals().

As a result, MimeType.hashCode() disagreed with MimeType.equals() for
parameter names that differ only in case, breaking the equals/hashCode
contract: text/plain;FOO=bar and text/plain;foo=bar are equal but hash
differently, so one is not found in a hash-based collection holding the
other. MimeType.compareTo() had the same blind spot for the charset
parameter.

MediaType was affected in two further ways: an out-of-range quality
value escaped validation when spelled Q=, and removeQualityValue() left
a Q= parameter in place.

Signed-off-by: Artyom Tsvirko <36863599+lArtiquel@users.noreply.github.com>
2026-08-31 17:30:39 +02:00
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