Improve support for HTTP 1.0 clients

sdk/lib/io/http_headers.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.
 
 part of dart.io;
 
 class _HttpHeaders implements HttpHeaders {
   _HttpHeaders(String this.protocolVersion)
       : _headers = new Map<String, List<String>>();
 
@@ skipping 32 matching lines @@
 
   void remove(String name, Object value) {
     _checkMutable();
     name = name.toLowerCase();
     List<String> values = _headers[name];
     if (values != null) {
       int index = values.indexOf(value);
       if (index != -1) {
         values.removeRange(index, 1);
       }
+      if (values.length == 0) _headers.remove(name);
     }
   }
 
   void removeAll(String name) {
     _checkMutable();
     name = name.toLowerCase();
     _headers.remove(name);
   }
 
   void forEach(void f(String name, List<String> values)) {
@@ skipping 252 matching lines @@
         (_noFoldingHeaders != null &&
          _noFoldingHeaders.indexOf(name) != -1)) {
       return false;
     }
     return true;
   }
 
   void _finalize() {
     // If the content length is not known make sure chunked transfer
     // encoding is used for HTTP 1.1.
-    if (contentLength < 0 && protocolVersion == "1.1") {
-      chunkedTransferEncoding = true;
+    if (contentLength < 0) {
+      if (protocolVersion == "1.0") {
+        persistentConnection = false;
+      } else {
+        chunkedTransferEncoding = true;
+      }
     }
     // If a Transfer-Encoding header field is present the
     // Content-Length header MUST NOT be sent (RFC 2616 section 4.4).
     if (chunkedTransferEncoding &&
         contentLength >= 0 &&
         protocolVersion == "1.1") {
       contentLength = -1;
     }
     _mutable = false;
   }
@@ skipping 441 matching lines @@
 
   String name;
   String value;
   DateTime expires;
   int maxAge;
   String domain;
   String path;
   bool httpOnly = false;
   bool secure = false;
 }