dio https connect can not keep Alive?

[DevaLee]

Package

dio

Version

5.4.0

Operating-System

iOS

Output of flutter doctor -v

[!] Flutter (Channel unknown, 3.10.0, on macOS 14.1.1 23B81 darwin-arm64, locale
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      Currently on an unknown channel. Run `flutter channel` to switch to an
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      If that doesn't fix the issue, reinstall Flutter by following instructions
      at https://flutter.dev/docs/get-started/install.
    ! Unknown upstream repository.
      Reinstall Flutter by following instructions at
      https://flutter.dev/docs/get-started/install.
    • Framework revision 84a1e904f4 (9 months ago), 2023-05-09 07:41:44 -0700
    • Engine revision d44b5a94c9
    • Dart version 3.0.0
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Dart Version

3.10.0

Steps to Reproduce

use dio package to request， every request need TLS shakehand， I expected : use persistence connect, not every time need TLS shake hand

@override void initState() { // TODO: implement initState super.initState();

// _dio.options.connectTimeout?(Duration(seconds: 5));
_dio.httpClientAdapter = IOHttpClientAdapter(
  createHttpClient: () {
    final client = HttpClient();

    client.findProxy = (uri) {
      // Proxy all request to localhost:8888.
      // Be aware, the proxy should went through you running device,
      // not the host platform.
      return 'PROXY 192.168.1.31:8888';
    };
    client.badCertificateCallback =
        (X509Certificate cert, String host, int port) => true;
    return client;
  },

);

} void _incrementCounter() async { var response = await _dio.post("https://qa-xxxxxxxxxxxxxx/article/merchant/operate" ,data: { "type": 7, "articleId":9850245 },options: Options()..persistentConnection = true); print(response); }

Expected Result

kept Alive : true TLS handshake : -

https 连接能持久连接， 不需要每次都TLS 握手

Actual Result

[DevaLee]

每发一次请求，Client Address的端口值都会变。 我使用 iOS原生网络请求框架 Alamofire进行网络请求时，Client Address的端口值不会变，HTTPS连接会进行持久连接，Kept Alive 值为true，TLS HandShake 值为 -

能帮我看一下，在dio中如何能 保持持久连接么？每次请求不需要重新进行 TLS 握手。

[hc79879]

I also encountered the same problem

[OnClickListener2048]

same here

[zombiu]

how to fix

[shaopx]

is this a new issue?

[shaopx]

I solve this by the following code: HttpClient createMyHttpClient() { return HttpClient()..idleTimeout = const Duration(seconds: 300); } _dio.httpClientAdapter = IOHttpClientAdapter(createHttpClient: createMyHttpClient);

[OnClickListener2048]

I solve this by the following code: HttpClient createMyHttpClient() { return HttpClient()..idleTimeout = const Duration(seconds: 300); } _dio.httpClientAdapter = IOHttpClientAdapter(createHttpClient: createMyHttpClient);

thanks, but i don't know if it really works, how can i test it ?

[shaopx]

I solve this by the following code: HttpClient createMyHttpClient() { return HttpClient()..idleTimeout = const Duration(seconds: 300); } _dio.httpClientAdapter = IOHttpClientAdapter(createHttpClient: createMyHttpClient);

thanks, but i don't know if it really works, how can i test it ?

use flutter devtools --> network tab, check the connection establish time.

[AlexV525]

idleTimeout corresponds to the alive time of the client. If your client got released in a short time, please consider increasing the configuration. It's also recommended to test with the dart:io:HttpClient and package:http.

[zerg000000]

This is why keep-alive not working. The default idleTimeout for underlying package:http is 15 seconds. However, don't know why dio set it to 3 seconds. According to package:http documentation. The non-active connection in pool will be closed by min(idleTimeout, keep-alive timeout).

https://github.com/cfug/dio/blob/cca84395f6ddf92869a48ca9de4f11d23de2fa77/dio/lib/src/adapters/io_adapter.dart#L242

[zerg000000]

Dio 10 requests with no sleep in between Dio 10 requests with 4s sleep in between dart:http 10 requests with 4s sleep in between

[kuhnroyal]

The HttpClient.idleTimeout of 3 seconds has already been removed on the 6.0.0 branch. The behavior will not be changed for 5.x since this is in some ways a breaking change.

[AlexV525]

In order to get rid of the default 3 seconds timeout, either create a new HttpClient with a new timeout using createHttpClient or set the timeout using onHttpClientCreate (deprecated).