request.js

// This is a complete representation of an HTTP request

{
  // Whether or not the request is finished. This means that no more
  // data will be received. A request can be finished and errored, or
  // finished and successful.
  // Equal to:
  // state === '
  finished: {Boolean},
    
  // Whether or not the request failed for any reason: network requests,
  // aborted requests, status codes >= 400, and so on.
  failed: {Boolean},
    
  // The request can only be in one of these states at a time.
  state: {"requesting", "responding", "aborted", "errored", "complete"},
    
  // `null` while in a "requesting" state.
  response: {null|Response},
    
  // If there is a network error, then this will be that error.
  error: {null|Error}
}