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// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// @assertion void findProxy=(
/// String f(
/// Uri url
/// )
/// )
/// Sets the function used to resolve the proxy server to be used for opening a
/// HTTP connection to the specified url. If this function is not set, direct
/// connections will always be used.
/// The string returned by f must be in the format used by browser PAC (proxy
/// auto-config) scripts. That is either
/// "DIRECT"
/// for using a direct connection or
/// "PROXY host:port"
/// for using the proxy server host on port port.
/// A configuration can contain several configuration elements separated by
/// semicolons, e.g.
/// "PROXY host:port; PROXY host2:port2; DIRECT"
/// The static function findProxyFromEnvironment on this class can be used to
/// implement proxy server resolving based on environment variables.
/// @description Checks that this setter sets the function used to resolve the
/// proxy server to be used for opening a HTTP connection to the specified url.
/// Test "PROXY" connection and Basic authentication
/// @author
import "dart:io";
import 'dart:async';
import "dart:convert";
import "../../../Utils/expect.dart";
test() async {
bool authenticateProxyCalled = false;
bool findProxyCalled = false;
HttpServer server = await HttpServer.bind(InternetAddress.loopbackIPv4, 0);
server.listen((HttpRequest request) {
if (request.headers[HttpHeaders.proxyAuthorizationHeader] == null) {
request.response.statusCode = HttpStatus.unauthorized;
.set(HttpHeaders.proxyAuthenticateHeader, 'Basic, realm=realm');
request.response.statusCode = HttpStatus.proxyAuthenticationRequired;
} else {
var authorization = request.headers[HttpHeaders.proxyAuthorizationHeader]?[0];
String encoded = base64.encode(utf8.encode("co19-test:password"));
Expect.equals("Basic ${encoded}", authorization);
HttpClient client = new HttpClient();
client.findProxy = (Uri uri) {
findProxyCalled = true;
return "PROXY ${InternetAddress.loopbackIPv4.address}:${server.port}";
client.authenticateProxy =
(String host, int port, String scheme, String? realm) {
authenticateProxyCalled = true;
Expect.equals(InternetAddress.loopbackIPv4.address, host);
Expect.equals(server.port, port);
Expect.equals("Basic", scheme);
Expect.equals("realm", realm);
Completer<bool> completer = new Completer<bool>();
client.addProxyCredentials(InternetAddress.loopbackIPv4.address, port,
"realm", new HttpClientBasicCredentials("co19-test", "password"));
return completer.future;
.then((HttpClientRequest request) => request.close())
.then((HttpClientResponse response) {
response.cast<List<int>>().transform(utf8.decoder).listen((content) {});
main() {