http2 1.0.0

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HTTP/2 for Dart #

This library provides an http/2 interface on top of a bidirectional stream of bytes.

Usage: #

Here is a minimal example of connecting to a http/2 capable server, requesting a resource and iterating over the response.

import 'dart:convert';
import 'dart:io';

import 'package:http2/http2.dart';

main() async {
  var uri = Uri.parse('');

  var transport = new ClientTransportConnection.viaSocket(
    await SecureSocket.connect(,
      supportedProtocols: ['h2'],

  var stream = transport.makeRequest(
      new Header.ascii(':method', 'GET'),
      new Header.ascii(':path', uri.path),
      new Header.ascii(':scheme', uri.scheme),
      new Header.ascii(':authority',,
    endStream: true,

  await for (var message in stream.incomingMessages) {
    if (message is HeadersStreamMessage) {
      for (var header in message.headers) {
        var name = utf8.decode(;
        var value = utf8.decode(header.value);
        print('Header: $name: $value');
    } else if (message is DataStreamMessage) {
      // Use [message.bytes] (but respect 'content-encoding' header)
  await transport.finish();

An example with better error handling is available here.

See the API docs for more details.

Features and bugs #

Please file feature requests and bugs at the issue tracker.

1.0 #

  • Graduate package to 1.0.
  • package:http2/http2.dart now reexports package:http2/transport.dart.

0.1.9 #

  • Discard messages incoming after stream cancellation.

0.1.8+2 #

  • On connection termination, try to dispatch existing messages, thereby avoiding terminating existing streams.

  • Fix ClientTransportConnection.isOpen to return false if we have exhausted the number of max-concurrent-streams.

0.1.8+1 #

  • Switch all uppercase constants from dart:convert to lowercase.

0.1.8 #

  • More changes required for making tests pass under Dart 2.0 runtime.
  • Modify sdk constraint to require '>=2.0.0-dev.40.0'.

0.1.7 #

  • Fixes for Dart 2.0.

0.1.6 #

  • Strong mode fixes and other cleanup.

0.1.5 #

  • Removed use of new Function syntax, since it isn't fully supported in Dart 1.24.

0.1.4 #

  • Added an onActiveStateChanged callback to Connection, which is invoked when the connection changes state from idle to active or from active to idle. This can be used to implement an idle connection timeout.

0.1.3 #

  • Fixed a bug where a closed window would not open correctly due to an increase in initial window size.

0.1.2 #

  • The endStream bit is now set on the requested frame, instead of on an empty data frame following it.
  • Added an onTerminated hook that is called when a TransportStream receives a RST_STREAM frame.

0.1.1+2 #

  • Add errorCode to exception toString message.

0.1.1+1 #

  • Fixing a performance issue in case the underlying socket is not writeable
  • Allow clients of MultiProtocolHttpServer to supply [http.ServerSettings]
  • Allow the draft version 'h2-14' in the ALPN protocol negogiation.

0.1.1 #

  • Adding support for MultiProtocolHttpServer in the package:http2/multiprotocol_server.dart library

0.1.0 #

  • First version of a HTTP/2 transport implementation in the package:http2/transport.dart library

0.0.1 #

  • Initial version

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  http2: ^1.0.0

2. Install it

You can install packages from the command line:

with pub:

$ pub get

with Flutter:

$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:http2/http2.dart';
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Learn more about scoring.

We analyzed this package on Mar 27, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6

Health suggestions

Fix lib/src/hpack/hpack.dart. (-25 points)

Analysis of lib/src/hpack/hpack.dart reported 80 hints, including:

line 31 col 32: Unnecessary new keyword.

line 32 col 32: Unnecessary new keyword.

line 35 col 37: Use = to separate a named parameter from its default value.

line 36 col 38: Use = to separate a named parameter from its default value.

line 48 col 51: Use = to separate a named parameter from its default value.

Fix lib/src/hpack/huffman_table.dart. (-25 points)

Analysis of lib/src/hpack/huffman_table.dart reported 261 hints, including:

line 10 col 40: Unnecessary new keyword.

line 11 col 5: Unnecessary new keyword.

line 12 col 5: Unnecessary new keyword.

line 20 col 46: Avoid const keyword.

line 21 col 3: Avoid const keyword.

Fix lib/src/streams/stream_handler.dart. (-18.98 points)

Analysis of lib/src/streams/stream_handler.dart reported 42 hints, including:

line 134 col 58: Unnecessary new keyword.

line 176 col 12: Unnecessary new keyword.

line 187 col 12: Unnecessary new keyword.

line 221 col 23: Unnecessary new keyword.

line 239 col 66: Use = to separate a named parameter from its default value.

Fix additional 21 files with analysis or formatting issues. (-104.12 points)

Additional issues in the following files:

  • lib/src/connection.dart (37 hints)
  • lib/src/frames/frame_reader.dart (21 hints)
  • lib/src/testing/client.dart (21 hints)
  • lib/src/flowcontrol/stream_queues.dart (20 hints)
  • lib/src/frames/frame_writer.dart (17 hints)
  • lib/src/testing/debug.dart (14 hints)
  • lib/src/flowcontrol/connection_queues.dart (13 hints)
  • lib/transport.dart (11 hints)
  • lib/multiprotocol_server.dart (10 hints)
  • lib/src/hpack/huffman.dart (9 hints)
  • lib/src/settings/settings.dart (9 hints)
  • lib/src/async_utils/async_utils.dart (6 hints)
  • lib/src/error_handler.dart (6 hints)
  • lib/src/frames/frame_types.dart (6 hints)
  • lib/src/flowcontrol/window_handler.dart (4 hints)
  • lib/src/frames/frame_defragmenter.dart (4 hints)
  • lib/src/connection_preface.dart (3 hints)
  • lib/src/ping/ping_handler.dart (3 hints)
  • lib/src/artificial_server_socket.dart (1 hint)
  • lib/src/byte_utils.dart (1 hint)
  • lib/src/flowcontrol/window.dart (1 hint)

Maintenance suggestions

Package is getting outdated. (-28.22 points)

The package was last published 66 weeks ago.

The package description is too short. (-20 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Maintain an example.

None of the files in the package's example/ directory matches known example patterns.

Common filename patterns include main.dart, example.dart, and http2.dart. Packages with multiple examples should provide example/

For more information see the pub package layout conventions.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.56.0 <3.0.0
Dev dependencies
mockito ^4.0.0
test ^1.2.0