Allow proxy settings in environment variables to be full URLs

tests/standalone/io/http_proxy_configuration_test.dart

 // Copyright (c) 2013, 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.
 
 import "package:expect/expect.dart";
 import "dart:io";
 import "dart:uri";
 
 expect(expected, String uri, environment) {
   Expect.equals(expected,
                 HttpClient.findProxyFromEnvironment(Uri.parse(uri),
                                                     environment: environment));
 }
 
 expectDirect(String uri, environment) {
   Expect.equals("DIRECT",
                 HttpClient.findProxyFromEnvironment(Uri.parse(uri),
                                                     environment: environment));
 }
 
 main() {
   expectDirect("http://www.google.com", {});
+
   expect("PROXY www.proxy.com:1080",
          "http://www.google.com",
          {"http_proxy": "www.proxy.com"});
   expect("PROXY www.proxys.com:1080",
          "https://www.google.com",
          {"https_proxy": "www.proxys.com"});
   expect("PROXY www.proxy.com:8080",
          "http://www.google.com",
          {"http_proxy": "www.proxy.com:8080"});
   expect("PROXY www.proxys.com:8080",
          "https://www.google.com",
          {"https_proxy": "www.proxys.com:8080"});
   expect("PROXY www.proxy.com:8080",
          "http://www.google.com",
          {"http_proxy": "www.proxy.com:8080",
           "https_proxy": "www.proxy.com:8080"});
   expect("PROXY www.proxys.com:8080",
          "https://www.google.com",
          {"http_proxy": "www.proxy.com:8080",
           "https_proxy": "www.proxys.com:8080"});
+
+  expect("PROXY www.proxy.com:1080",
+         "http://www.google.com",
+         {"http_proxy": "http://www.proxy.com"});
+  expect("PROXY www.proxy.com:1080",
+         "http://www.google.com",
+         {"http_proxy": "http://www.proxy.com/"});
+  expect("PROXY www.proxy.com:8080",
+         "http://www.google.com",
+         {"http_proxy": "http://www.proxy.com:8080/"});
+  expect("PROXY www.proxy.com:8080",
+         "http://www.google.com",
+         {"http_proxy": "http://www.proxy.com:8080/index.html"});
+  expect("PROXY www.proxy.com:8080",
+         "http://www.google.com",
+         {"http_proxy": "http://www.proxy.com:8080/",
+          "https_proxy": "http://www.proxy.com:8080/"});
+  expect("PROXY www.proxys.com:8080",
+         "https://www.google.com",
+         {"http_proxy": "http://www.proxy.com:8080/",
+          "https_proxy": "http://www.proxys.com:8080/"});
+  expect("PROXY www.proxy.com:8080",
+         "http://www.google.com",
+         {"http_proxy": "http://www.proxy.com:8080/",
+          "https_proxy": "http://www.proxy.com:8080/index.html"});
+  expect("PROXY www.proxys.com:8080",
+         "https://www.google.com",
+         {"http_proxy": "http://www.proxy.com:8080/",
+          "https_proxy": "http://www.proxys.com:8080/index.html"});
+
   expectDirect("http://www.google.com",
                {"http_proxy": "www.proxy.com:8080",
                 "no_proxy": "www.google.com"});
   expectDirect("http://www.google.com",
                {"http_proxy": "www.proxy.com:8080",
                 "no_proxy": "google.com"});
   expectDirect("http://www.google.com",
                {"http_proxy": "www.proxy.com:8080",
                 "no_proxy": ".com"});
   expectDirect("http://www.google.com",
                {"http_proxy": "www.proxy.com:8080",
                 "no_proxy": ",,  , www.google.edu,,.com    "});
   expectDirect("http://www.google.edu",
                {"http_proxy": "www.proxy.com:8080",
                 "no_proxy": ",,  , www.google.edu,,.com    "});
   expectDirect("http://www.google.com",
                {"https_proxy": "www.proxy.com:8080"});
 }