class Grape::Middleware::Versioner::Path


=> ‘v1’
‘/resource’:
The following rack env variables are set and path is rewritten to
/v1/resource
Example: For a uri path
versions, a 404 error is thrown.
path. If the version substring does not match any potential initialized
based on the uri path and removes the version substring from the uri
This middleware sets various version related rack environment variables

def before 

def before
  path_info = Grape::Router.normalize_path(env[Rack::PATH_INFO])
  return if path_info == '/'
  [mount_path, Grape::Router.normalize_path(prefix)].each do |path|
    path_info.delete_prefix!(path) if path.present? && path != '/' && path_info.start_with?(path)
  end
  slash_position = path_info.index('/', 1) # omit the first one
  return unless slash_position
  potential_version = path_info[1..slash_position - 1]
  return unless potential_version.match?(pattern)
  version_not_found! unless potential_version_match?(potential_version)
  env[Grape::Env::API_VERSION] = potential_version
end