Connect establishes a new connection to the URL, determining the correct handler to use for the schema.

ConnectContext establishes a new connection to the URL, passing the context down to the handler and determining the correct handler to use for the schema.

ConnectTimeout establishes a new connection to the URL, waiting at most the specified timeout for the connection to be established, determining the correct handler to use for the schema.

RegisterConnectionHandler is used by connection APIs to register their handlers.

SetupEtcd instantiates an etcd connection handler with a new etcd client configured from the parameters passed.

UseExistingEtcd instantiates an etcd connection handler pointing at a preconfigured etcd client.

ConnectionHandler specifies the basic functionality which must be provided by any connection setup handlers in order to be registered.