如何在Flutter上使用Json Body进行HTTP发布 [英] How to Http Post with Json Body on Flutter

问题描述

我正在尝试从API获取数据。我需要在没有标题的邮递员中从正文传递值：不显示应用程序/ JSON数据。

I am trying to get data from API. I need to pass value from the body, in postman without a header: application/JSON data is not displayed.

final response = await http.post(
      "http://192.168.10.25:8080/Login/validateusername",
    body: {"username": "user@PYA"},
      headers: {'Content-Type': 'application/json'},
    );

错误消息：

E/flutter (28851): [ERROR:flutter/shell/common/shell.cc(184)] Dart Error: Unhandled exception:
E/flutter (28851): Bad state: Cannot set the body fields of a Request with content-type "application/json".

推荐答案

添加内容类型 application / json

Future<String> apiRequest(String url, Map jsonMap) async {
  HttpClient httpClient = new HttpClient();
  HttpClientRequest request = await httpClient.postUrl(Uri.parse(url));
  request.headers.set('content-type', 'application/json');
  request.add(utf8.encode(json.encode(jsonMap)));
  HttpClientResponse response = await request.close();
  // todo - you should check the response.statusCode
  String reply = await response.transform(utf8.decoder).join();
  httpClient.close();
  return reply;
}

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