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HTTP-Version
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... The version of an HTTP message is indicated by an HTTP-Version field
in the first line of the message.
...
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Applications sending Request or Response messages, as defined by this
specification, MUST include an HTTP-Version of "HTTP/1.1". Use of
this version number ...
... cache obeying all of the
cache-control directives defined for its native HTTP-version, obeying
certain extensions, and ignoring all directives that it does not
understand.
...
...
version: The HTTP-Version number of the enclosed message
(e.g., "1.1"). If not present, the version can be
...