Use GZIP on pub servers.

lib/src/io.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.
 
 /// Helper functionality to make working with IO easier.
 library pub.io;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
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     var tempDir = createSystemTempDir();
     return new Future.sync(() => fn(tempDir))
         .whenComplete(() => deleteEntry(tempDir));
   });
 }
 
 /// Binds an [HttpServer] to [host] and [port].
 ///
 /// If [host] is "localhost", this will automatically listen on both the IPv4
 /// and IPv6 loopback addresses.
-Future<HttpServer> bindServer(String host, int port) {
-  if (host == 'localhost') return HttpMultiServer.loopback(port);
-  return HttpServer.bind(host, port);
+Future<HttpServer> bindServer(String host, int port) async {
+  var server = host == 'localhost'
+      ? await HttpMultiServer.loopback(port)
+      : await HttpServer.bind(host, port);
+  server.autoCompress = true;
+  return server;
 }
 
 /// Extracts a `.tar.gz` file from [stream] to [destination].
 Future extractTarGz(Stream<List<int>> stream, String destination) async {
   log.fine("Extracting .tar.gz stream to $destination.");
 
   if (Platform.operatingSystem == "windows") {
     return await _extractTarGzWindows(stream, destination);
   }
 
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   // TODO(rnystrom): Remove this and change to returning one string.
   static List<String> _toLines(String output) {
     var lines = splitLines(output);
     if (!lines.isEmpty && lines.last == "") lines.removeLast();
     return lines;
   }
 
   bool get success => exitCode == exit_codes.SUCCESS;
 }