dio_http2_adapter 0.0.2

A Dio HttpClientAdapter which support Http/2.0(Support connection reuse, header compression, server pushing is not supported yet.)

Http2Adapter

A Dio HttpClientAdapter which implements Http/2.0 .

Getting Started

Install

dependencies:
  dio_http2_adapter: x.x.x  #latest version

Usage

import 'package:dio/dio.dart';
import 'package:dio_http2_adapter/http2.dart'; 

main() async {
  var dio = Dio()
    ..options.baseUrl = "https://www.ustc.edu.cn/"
    ..httpClientAdapter = Http2Adapter();

  Response<String> response;
  response = await dio.get("/?xx=6");
  print(response.data);
  response = await dio.get("2062/list.htm");
  print(response.data);
}

ConnectionManager

ConnectionManager is used to manager the connections that should be reusable. The main responsibility of ConnectionManager is to implement a connection reuse strategy for http2.

dio.httpClientAdapter = Http2Adapter(
  ConnectionManager(
    idleTimeout: 10000,
    /// Ignore bad certificate
    onClientCreate: (_, clientSetting) => clientSetting.onBadCertificate = (_) => true,
  ),
);

• idleTimeout： Sets the idle timeout(milliseconds) of non-active persistent connections. For the sake of socket reuse feature with http/2, the value should not be less than 1000 (1s).
• onClientCreate：Callback when socket created. We can set trusted certificates and handler for unverifiable certificates.

You can also custom a connection manager with a specific connection reuse strategy by implementing the ConnectionManager.

Attention

Http2Adapter doesn't support redirection yet, so we can't get information about redirection through Response, for example, the following code will be true：

response.redirects==null 
response.isRedirect==null;  

However, we can use the status code to determine whether redirection is necessary:

if(response.statusCode==301||response.statusCode==302){
  String redirectUrl=response.headers.value("location");
  // do something
}