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0c548e62d0
HttpRequest.get_preferred_type() did not account for parameters in Accept header media types (e.g., "text/vcard; version=3.0"). This caused incorrect content negotiation when multiple types differed only by parameters, reducing specificity as per RFC 7231 section 5.3.2 (https://datatracker.ietf.org/doc/html/rfc7231.html#section-5.3.2). This fix updates get_preferred_type() to treat media types with parameters as distinct, allowing more precise and standards-compliant matching. Thanks to magicfelix for the report, and to David Sanders and Sarah Boyce for the reviews. Backport of c075508b4de8edf9db553b409f8a8ed2f26ecead from main.