Use and Interpretation of HTTP Version Numbers

Jeffrey C. Mogul, Roy Thomas Fielding, Jim Gettys, Henrik Frystyk Nielsen


HTTP request and response messages include an HTTP protocol version number. Some confusion exists concerning the proper use and interpretation of HTTP version numbers, and concerning interoperability of HTTP implementations of different protocol versions. This document is an attempt to clarify the situation. It is not a modification of the intended meaning of the existing HTTP/1.0 and HTTP/1.1 documents, but it does describe the intention of the authors of those documents, and can be considered definitive when there is any ambiguity in those documents concerning HTTP version numbers, for all versions of HTTP.


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