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spring-framework/spring-web
Brian Clozel 079992021c Improve MimeType parser for RFC compliance
Prior to this commit, the `MimeType` class would compare raw parameter
values for the equals/hashcode contract. This went against the RFC which
states that quoted and unquoted parameter values are equivalent.

This commit rewrote the entire `MimeType` parser in `MimeTypeUtils`
as a state parser to improve robustness and performance.
The `MimeType` equals, compareTo and hascode contracts now unquote
parameter values before comparing them.

This change also optimizes the `tokenize` function that splits many
comma-separated MIME types into a list. Now that this method isn't used
anywhere else, it is also deprecated as of 7.1. This method was
initially made public to be reused within Spring Framework and has no
particular use in Spring applications in general.

Finally, this also makes `MediaType` and `MimeType` leverage the
`MimeType` LRU cache as much as possible, including when parsing
`Accept:` HTTP headers.

Closes gh-36729
2026-07-24 14:29:36 +02:00
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