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util: make MIMEParams accessors case-insensitive#64123
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MIME parameter names are case-insensitive and the parser already
ASCII-lowercases them, but MIMEParams.get(), has(), delete() and set()
compared against the raw argument. As a result a parsed parameter was
unreachable by the casing the caller used (e.g. params.get('Charset')
returned null for "Charset=utf-8"), and set() could create duplicate,
case-colliding parameters.
Lowercase the name in the accessors to match the parser, consistent with
the whatwg-mimetype reference implementation.
Signed-off-by: Daijiro Wachi <daijiro.wachi@gmail.com>
lpinca
approved these changes
Jun 25, 2026
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MIME parameter names are case-insensitive and the parser already ASCII-lowercases them, but MIMEParams.get(), has(), delete() and set() compared against the raw argument. As a result a parsed parameter was unreachable by the casing the caller used (e.g. params.get('Charset') returned null for "Charset=utf-8"), and set() could create duplicate, case-colliding parameters.
Lowercase the name in the accessors to match the parser, consistent with the whatwg-mimetype reference implementation.