Allow HTTP response without reason phrase

tests/standalone/io/http_no_reason_phrase_test.dart

+// (c) 2014, 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
+
+import "package:expect/expect.dart";
+import "dart:async";
+import "dart:isolate";
+import "dart:io";
+
+// Test that a response line without any reason phrase is handled.
+void missingReasonPhrase(int statusCode, bool includeSpace) {
+  var client = new HttpClient();
+  ServerSocket.bind("127.0.0.1", 0).then((server) {
+     server.listen((client) {
+        if (includeSpace) {
+          client.write("HTTP/1.1 $statusCode \r\n\r\n");
+        } else {
+          client.write("HTTP/1.1 $statusCode\r\n\r\n");
+        }
+        client.close();
+      });
+      client.getUrl(Uri.parse("http://127.0.0.1:${server.port}/"))
+        .then((request) => request.close())
+        .then((response) {
+          Expect.equals(statusCode, response.statusCode);
+          Expect.equals("", response.reasonPhrase);
+        })
+        .whenComplete(() => server.close());
+  });
+}
+
+void main() {
+  missingReasonPhrase(HttpStatus.OK, true);
+  missingReasonPhrase(HttpStatus.INTERNAL_SERVER_ERROR, true);
+  missingReasonPhrase(HttpStatus.OK, false);
+  missingReasonPhrase(HttpStatus.INTERNAL_SERVER_ERROR, false);
+}