class Aws::Plugins::EndpointDiscovery::Handler

def call(context)
  if context.operation.endpoint_operation
    context.http_request.headers['x-amz-api-version'] = context.config.api.version
    _apply_endpoint_discovery_user_agent(context)
  elsif discovery_cfg = context.operation.endpoint_discovery
    endpoint = _discover_endpoint(
      context,
      Aws::Util.str_2_bool(discovery_cfg["required"])
    )
    context.http_request.endpoint = _valid_uri(endpoint.address) if endpoint
    if endpoint || context.config.endpoint_discovery
      _apply_endpoint_discovery_user_agent(context)
    end
  end
  @handler.call(context)
end