HttpHeaders user-agent not working

[faner11]

HttpHeaders user-agent not working

flutter 1.17.4
Dio 3.0.9
Repro rate 100%

一个非常诡异的问题，当我使用dio请求时request.headers 显示ua已经设置，但是并没有生效。

final ua =
        "Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1";

final url = "https://v.douyin.com/JLcscxJ/";

void dioHttp(String url, String ua) async {
  try {
    final response = await Dio().get(url,
          options: Options(headers: {HttpHeaders.userAgentHeader: ua}));
      print(response.data.toString().length);
    } catch (e) {
      print(e);
    }
}

void ioHttp(String url, String ua) async {
    final uri = Uri.parse(url);
    final httpClient = new HttpClient();
    httpClient.userAgent = ua;
    final request = await httpClient.getUrl(uri);
    final response = await request.close();
    final responseBody = await response.transform(Utf8Decoder()).join();
    print(responseBody.length);
}

经过一些尝试，我可以通过ioHttp这个方法获得正确的返回，dioHttp这个方法无法得到正常的返回，让我诡异的是两个http请求的headers是相同的。

[faner11]

我找到新的可行的方法，但是我希望client.userAgent = null 成为默认的配置

  void dioHttp(String url, String ua) async {
    var dio = Dio();
    (dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
        (HttpClient client) {
      client.userAgent = null;
    };
    var req = await dio.get(url,
        options: Options(headers: {HttpHeaders.userAgentHeader: ua}));
    print(req.data.toString().length);
  }

[stale]

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