Flutter：如何在 Flutter 中向 http 包添加标头答案

【问题标题】：Flutter: How to add headers to http package in flutterFlutter：如何在 Flutter 中向 http 包添加标头
【发布时间】：2019-11-25 19:48:41
【问题描述】：

我正在尝试使用flutter包http调用以下API，请求的结构是

GET /api/v3/4870020/products/123123?lang=en&token=123456789abcd HTTP/1.1
Host: app.ecwid.com
Content-Type: application/json;charset=utf-8
Cache-Control: no-cache

如何使用 http 包调用此 API。

【问题讨论】：

标签： flutter get request

【解决方案1】：

您可以使用来自http 包的get()。试试这个：

  Future<void> fetchData(String lang, String token) async {
    final host = "app.ecwid.com"; // this is your baseUrl
    final apiPath = "api/v3/4870020/products/123123"; // which api do you want to use?
    final url = "https://$host/$apiPath?lang=$lang&token=$token"; // final url
    final response = await http.get(
      url,
      headers: {
        "Content-Type": "application/json",
        "Cache-Control": "no-cache"
      }
    );

    if(response.statusCode == 200) {
      // do some stuff with the received data.
    }
    else return;
  }

如您所见，我们将语言和令牌参数指定到 url 的末尾。

See the documentation

【讨论】：

谢谢@Firat

【解决方案2】：

您必须创建自己的客户端并覆盖发送方法以添加您的标头

class HttpClient extends http.BaseClient {
    final http.Client _client = http.Client(); //your http client

    @override
    Future<http.StreamedResponse> send(http.BaseRequest request) {
        //add your headers in request here
        return this._client.send(request)
    }

}

【讨论】：

感谢您的评论