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version number
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... understanding further HTTP communication, rather than the features
obtained via that communication. No change is made to the version
number for the addition of message components which do not affect
communication behavior or which only add to extensible field values.
The <minor> number is incremented when the changes made to the
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... HTTP-Version of "HTTP/1.1". Use of
this version number indicates that the sending application is at
least conditionally compliant with this specification.
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Clients SHOULD remember the version number of at least the most
recently used server; if an HTTP/1.1 client ...
... protocol, such as a later version of HTTP with a higher major version
number, even though the current request has been made using HTTP/1.1.
This eases the difficult transition between incompatible protocols by
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