// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

[DartPackage="mojo_services"]
module mojo;

import "mojo/public/interfaces/network/network_error.mojom";
import "mojo/public/interfaces/network/url_request.mojom";
import "mojo/public/interfaces/network/url_response.mojom";

struct URLLoaderStatus {
  // If the loader has failed due to a network level error, this field will be
  // set.
  NetworkError? error;

  // Set to true if the URLLoader is still working. Set to false once an error
  // is encountered or the response body is completely copied to the response
  // body stream.
  bool is_loading;

  // TODO(darin): Add further details about the stages of loading (e.g.,
  // "resolving host") that happen prior to receiving bytes.
};

interface URLLoader {
  // Loads the given |request|, asynchronously producing |response|. Consult
  // |response| to determine if the request resulted in an error, was
  // redirected, or has a response body to be consumed.
  Start(URLRequest request) => (URLResponse response);

  // If the request passed to |Start| had |auto_follow_redirects| set to false,
  // then upon receiving an URLResponse with a non-NULL |redirect_url| field,
  // |FollowRedirect| may be called to load the URL indicated by the redirect.
  FollowRedirect() => (URLResponse response);

  // Query status about the URLLoader.
  QueryStatus() => (URLLoaderStatus status);
};