Fix a number of HTTP issues

sdk/lib/io/http_parser.dart

Index: sdk/lib/io/http_parser.dart
diff --git a/sdk/lib/io/http_parser.dart b/sdk/lib/io/http_parser.dart
index 7bb9197b48abb7935cbbdb2baaaa9085f24202ee..9dd569b9fde4e95c60190e9f6ffb422edef36376 100644
--- a/sdk/lib/io/http_parser.dart
+++ b/sdk/lib/io/http_parser.dart
@@ -630,10 +630,10 @@ class _HttpParser {
   }
 
   void streamError(e) {
-    // Don't report errors when HTTP parser is in idle state. Clients
-    // can close the connection and cause a connection reset by peer
-    // error which is OK.
-    if (_state == _State.START) {
+    // Don't report errors for a request parser when HTTP parser is in
+    // idle state. Clients can close the connection and cause a
+    // connection reset by peer error which is OK.
+    if (_requestParser && _state == _State.START) {
       closed();
       return;
     }
@@ -654,6 +654,10 @@ class _HttpParser {
     _state = _State.CANCELED;
   }
 
+  void restart() {
+    _reset();
+  }
+
   int get messageType => _messageType;
   int get contentLength => _contentLength;
   bool get upgrade => _connectionUpgrade && _state == _State.UPGRADED;