Flutter - 处理 POST 请求中的状态代码 302 [英] Flutter - Handle status code 302 in POST request

问题描述

我正在尝试使用 DIO 包在 Flutter 中发送 post 请求.

I'm trying to send a post request in Flutter with DIO package.

这是请求:

getSessionId() async {

  var csrf = await getCsrftoken();

  var dio = new Dio(new Options(
      baseUrl: "http://xxxxxxx/accounts/login/",
      connectTimeout: 5000,
      receiveTimeout: 100000,
      // 5s
      headers: {
        'Cookie': "csrftoken=" + csrf
      },
      contentType: ContentType.JSON,
      // Transform the response data to a String encoded with UTF8.
      // The default value is [ResponseType.JSON].
      responseType: ResponseType.PLAIN
  ));

  var response;
  response = await dio.post("http://xxxxxxx/accounts/login/",
    data: {
      "username": "xxxxx",
      "password": "xxxxx",
      "csrfmiddlewaretoken" : csrf
    },
    options: new Options(
        contentType: ContentType.parse("application/x-www-form-urlencoded")),
  );

  print("StatusCode: ");
  print(response.statusCode);
  print("Response cookie: ");   //THESE ARE NOT PRINTED
  print(response.headers);
}

收到请求后:

E/flutter ( 4567): [ERROR:flutter/shell/common/shell.cc(181)] Dart Error: Unhandled exception:
    E/flutter ( 4567): DioError [DioErrorType.RESPONSE]: Http status error [302]
    E/flutter ( 4567): #0      getSessionId (file:///C:/get_order/lib/main.dart:36:14)
    E/flutter ( 4567): <asynchronous suspension>

从此请求中，我只需要获取 sessionid cookie，但该函数因未处理的异常而停止.

From this request i only need to get the sessionid cookie, but the function stop with unhandled exception.

推荐答案

我是这样解决的:

添加 followRedirects: false 和 validateStatus: (status) { return status <;500;} 到请求.像这样:

Add followRedirects: false and validateStatus: (status) { return status < 500;} to the request. Like this:

var response = await Dio().post("http://myurl",
    data: requestBody,
    options: Options(
        followRedirects: false,
        validateStatus: (status) { return status < 500; }
    ),
);

通过这种方式，您可以从 302 中获取每个 headers 和其他.

This way you can get from the 302 every headers and other.

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