SpiderMan.handle_response

You're seeing just the callback handle_response, go back to SpiderMan module for more information.
Link to this callback

handle_response(arg1, context)

Specs

handle_response(SpiderMan.Response.t(), context :: map()) :: %{
  optional(:requests) => [SpiderMan.Request.t()],
  optional(:items) => [SpiderMan.Item.t()]
}