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Beast API Version

Beast maintains it's own API version, which is more fine-grained than the boost release.

It can be obtained as a string from the BOOST_BEAST_VERSION macro or a string through BOOST_BEAST_VERSION_STRING.

/* Identifies the API version of Beast.

   This is a simple integer that is incremented by one every
   time a set of code changes is merged to the develop branch.

// A string describing BOOST_BEAST_VERSION, that can be used in http headers.