Add 'Server' and 'User-Agent' default header fields.

tests/standalone/http_launch_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.
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 //
 // Test:
 //   *) Launching a script fetched over HTTP.
@@ skipping 43 matching lines @@
   Future<ProcessResult> http_pkg_root_run =
     Process.run(pathToExecutable,
                 ['--package-root=http://127.0.0.1:$port/packages/',
                 'http://127.0.0.1:$port/http_launch_main.dart']);
   Future<ProcessResult> isolate_run =
     Process.run(pathToExecutable,
                 ['http://127.0.0.1:$port/http_spawn_main.dart', '$port']);
   Future<List<ProcessResult>> results = Future.wait([no_http_run, http_run,
                                                      http_pkg_root_run,
                                                      isolate_run]);
   results.then((results) {

[Søren Gjesse, 2013/06/11 11:02:00]

Debug code.

[Anders Johnsen, 2013/06/11 11:37:55]

Done.

+      results.forEach((result) => print(result.stdout));
+      results.forEach((result) => print(result.stderr));
     // Close server.
     server.close();
     // Check results.
     checkResults(results);
   });
 }
 
 checkResults(List<ProcessResult> results) {
   Expect.equals(4, results.length);
   // Exited cleanly.
   for (int i = 0; i < results.length; i++) {
     ProcessResult result = results[i];
     Expect.equals(0, result.exitCode);
   }
   String stdout = results[0].stdout;
   // Output is the string 'hello'. Use startsWith to avoid new line differences.
   Expect.isTrue(stdout.startsWith('hello'));
   // Same output from all three process runs.
   for (int i = 0; i < results.length; i++) {
     Expect.equals(stdout, results[i].stdout);
   }
 }
 
 main() {
   HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, 0).then(serverRunning);
 }