Don't close the server until we have received the error.

tests/standalone/io/http_content_length_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:isolate";
 import "dart:io";
 
 void testNoBody(int totalConnections, bool explicitContentLength) {
   var errors = 0;
   HttpServer.bind("127.0.0.1", 0, totalConnections).then((server) {
@@ skipping 50 matching lines @@
           })
           .catchError((e) {
             Expect.fail("Unexpected error $e");
           });
     }
   });
 }
 
 void testBody(int totalConnections, bool useHeader) {
   HttpServer.bind("127.0.0.1", 0, totalConnections).then((server) {
+    int serverCount = 0;
     server.listen(
         (HttpRequest request) {
           Expect.equals("2", request.headers.value('content-length'));
           Expect.equals(2, request.contentLength);
           var response = request.response;
           if (useHeader) {
             response.contentLength = 2;
           } else {
             response.headers.set("content-length", 2);
           }
           request.listen(
               (d) {},
               onDone: () {
                 response.addString("x");
                 Expect.throws(() => response.contentLength = 3,
                               (e) => e is HttpException);
                 response.addString("x");
                 response.addString("x");
                 response.done
                     .then((_) {
                       Expect.fail("Unexpected successful response completion");
                     })
                     .catchError((e) {
-                      Expect.isTrue(e.error is HttpException, "[$e] [${e.error}]");
+                      Expect.isTrue(e.error is HttpException, "[$e]");
+                      if (++serverCount == totalConnections) {
+                        server.close();
+                      }
                     });
                 response.close();
                 Expect.throws(() => response.addString("x"),
                               (e) => e is StateError);
               });
         },
         onError: (e) => Expect.fail("Unexpected error $e"));
 
-    int count = 0;
+    int clientCount = 0;
     HttpClient client = new HttpClient();
     for (int i = 0; i < totalConnections; i++) {
       client.get("127.0.0.1", server.port, "/")
           .then((request) {
             if (useHeader) {
               request.contentLength = 2;
             } else {
               request.headers.add(HttpHeaders.CONTENT_LENGTH, "7");
               request.headers.add(HttpHeaders.CONTENT_LENGTH, "2");
             }
             request.addString("x");
             Expect.throws(() => request.contentLength = 3,
                           (e) => e is HttpException);
             request.addString("x");
             return request.close();
           })
           .then((response) {
             Expect.equals("2", response.headers.value('content-length'));
             Expect.equals(2, response.contentLength);
             response.listen(
                 (d) {},
                 onDone: () {
-                  if (++count == totalConnections) {
+                  if (++clientCount == totalConnections) {
                     client.close();
-                    server.close();
                   }
                 });
           });
     }
   });
 }
 
 void testBodyChunked(int totalConnections, bool useHeader) {
   HttpServer.bind("127.0.0.1", 0, totalConnections).then((server) {
     server.listen(
@@ skipping 94 matching lines @@
 
 void main() {
   testNoBody(5, false);
   testNoBody(5, true);
   testBody(5, false);
   testBody(5, true);
   testBodyChunked(5, false);
   testBodyChunked(5, true);
   testHttp10();
 }