OAuth 2.0 Library

 OAuth::Lite2 provides a lightweight OAuth library for Perl and Plack.
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 See also:
  https://oauth.net/2
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 Client
  OAuth::Lite2::Client::WebServer
  OAuth::Lite2::Client::UsernameAndPassword
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 Server
  OAuth::Lite2::Server::Endpoint::Token
  Plack::Middleware::Auth::OAuth2::ProtectedResource