Avoid using chunked transfer encoding when the HTTP verision is 1.0.

runtime/bin/http_impl.dart

Index: runtime/bin/http_impl.dart
diff --git a/runtime/bin/http_impl.dart b/runtime/bin/http_impl.dart
index ffe4563615fc3f88ff4147d34a447c44f1642841..58f0bbaf163a7dc58da5760eaffd80ab4a87bb70 100644
--- a/runtime/bin/http_impl.dart
+++ b/runtime/bin/http_impl.dart
@@ -399,6 +399,8 @@ class _HttpRequest extends _HttpRequestResponseBase implements HttpRequest {
     return _inputStream;
   }
 
+  String get protocolVersion() => _protocolVersion;
+
   void _onRequestStart(String method, String uri, String version) {
     _method = method;
     _uri = uri;
@@ -610,6 +612,11 @@ class _HttpResponse extends _HttpRequestResponseBase implements HttpResponse {
   bool _writeHeader() {
     List<int> data;
 
+    // HTTP/1.0 does not support chunked.
+    if (_protocolVersion == "1.0" && _contentLength < 0) {
+      throw new HttpException("Content length required for HTTP 1.0");
+    }
+
     // Write status line.
     if (_protocolVersion == "1.1") {
       _httpConnection._write(_Const.HTTP11);