Always set content length to 0 on redirect requests

tests/standalone/io/http_redirect_test.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
 //
 
 import "dart:io";
 import "dart:uri";
 
 HttpServer setupServer() {
   HttpServer server = new HttpServer();
   server.listen("127.0.0.1", 0, backlog: 5);
@@ skipping 91 matching lines @@
      (HttpRequest request, HttpResponse response) {
        Expect.fail("Redirect of POST should not happen");
      }
   );
 
   // Setup redirect for 303 where POST should turn into GET.
   server.addRequestHandler(
      (HttpRequest request) => request.path == "/303src",
      (HttpRequest request, HttpResponse response) {
        Expect.equals("POST", request.method);
-       response.headers.set(HttpHeaders.LOCATION,
-                            "http://127.0.0.1:${server.port}/303target");
-       response.statusCode = HttpStatus.SEE_OTHER;
-       response.outputStream.close();
+       Expect.equals(10, request.contentLength);
+       request.inputStream.onData = request.inputStream.read;
+       request.inputStream.onClosed = () {
+         response.headers.set(HttpHeaders.LOCATION,
+                              "http://127.0.0.1:${server.port}/303target");
+         response.statusCode = HttpStatus.SEE_OTHER;
+         response.outputStream.close();
+       };
      }
   );
   server.addRequestHandler(
      (HttpRequest request) => request.path == "/303target",
      (HttpRequest request, HttpResponse response) {
        Expect.equals("GET", request.method);
        response.outputStream.close();
      }
   );
 
@@ skipping 153 matching lines @@
 }
 
 void testAutoRedirect303POST() {
   HttpServer server = setupServer();
   HttpClient client = new HttpClient();
 
   var requestCount = 0;
 
   void onRequest(HttpClientRequest request) {
     requestCount++;
+    request.contentLength = 10;
+    request.outputStream.write(new List<int>.fixedLength(10, fill: 0));
     request.outputStream.close();
   };
 
   void onResponse(HttpClientResponse response) {
     Expect.equals(HttpStatus.OK, response.statusCode);
     response.inputStream.onData =
         () => Expect.fail("Response data not expected");
     response.inputStream.onClosed = () {
       Expect.equals(1, requestCount);
       server.close();
@@ skipping 49 matching lines @@
 main() {
   testManualRedirect();
   testManualRedirectWithHeaders();
   testAutoRedirect();
   testAutoRedirectWithHeaders();
   testAutoRedirect301POST();
   testAutoRedirect303POST();
   testAutoRedirectLimit();
   testRedirectLoop();
 }