Throw an error when we redirect on a non-persistent connection.

tests/standalone/io/http_redirect_test.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.
 //
 
 import "dart:io";
 import "dart:uri";
 
 HttpServer setupServer() {
   HttpServer server = new HttpServer();
@@ skipping 110 matching lines @@
      }
   );
   server.addRequestHandler(
      (HttpRequest request) => request.path == "/303target",
      (HttpRequest request, HttpResponse response) {
        Expect.equals("GET", request.method);
        response.outputStream.close();
      }
   );
 
+  // Setup redirect where we close the connection.
+  server.addRequestHandler(
+     (HttpRequest request) => request.path == "/closing",
+     (HttpRequest request, HttpResponse response) {
+       response.headers.set(HttpHeaders.LOCATION,
+                            "http://127.0.0.1:${server.port}/");
+       response.statusCode = HttpStatus.FOUND;
+       response.persistentConnection = false;
+       response.outputStream.close();
+     }
+  );
+
   return server;
 }
 
 void checkRedirects(int redirectCount, HttpClientConnection conn) {
   if (redirectCount < 2) {
     Expect.isNull(conn.redirects);
   } else {
     Expect.equals(redirectCount - 1, conn.redirects.length);
     for (int i = 0; i < redirectCount - 2; i++) {
       Expect.equals(conn.redirects[i].location.path, "/${i + 2}");
@@ skipping 204 matching lines @@
     response.inputStream.onClosed = () => Expect.fail("Response not expected");
   };
   conn.onError = (e) {
     Expect.isTrue(e is RedirectLoopException);
     Expect.equals(2, e.redirects.length);
     server.close();
     client.shutdown();
   };
 }
 
+void testRedirectClosingConnection() {
+  HttpServer server = setupServer();
+  HttpClient client = new HttpClient();
+
+  int redirectCount = 0;
+  HttpClientConnection conn =
+      client.getUrl(Uri.parse("http://127.0.0.1:${server.port}/closing"));
+
+  conn.followRedirects = true;
+  conn.onResponse = (HttpClientResponse response) {
+    response.inputStream.onData = () => Expect.fail("Response not expected");
+    response.inputStream.onClosed = () => Expect.fail("Response not expected");
+  };
+  conn.onError = (e) {
+    Expect.isTrue(e is RedirectException);
+    Expect.isNull(e.redirects);
+    server.close();
+    client.shutdown();
+  };
+}
+
 main() {
   testManualRedirect();
   testManualRedirectWithHeaders();
   testAutoRedirect();
   testAutoRedirectWithHeaders();
   testAutoRedirect301POST();
   testAutoRedirect303POST();
   testAutoRedirectLimit();
   testRedirectLoop();
+  testRedirectClosingConnection();
 }