This document aggregates Changes from RFC(s) 2616 (and 2617) sections from RFC7230 to RFC7235, which supersede RFC2616. See Mark Nottingham's blog post for further background.
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HTTP's approach to error handling has been explained. (Section 2.5)
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The HTTP-version ABNF production has been clarified to be case-sensitive. Additionally, version numbers have been restricted to single digits, due to the fact that implementations are known to handle multi-digit version numbers incorrectly. (Section 2.6)