错误状态:无法设置内容类型为"application/json"的请求的正文字段 [英] Bad state: Cannot set the body fields of a Request with content-type "application/json"

问题描述

Map<String,String> headers = {'Content-Type':'application/json','authorization':'Basic c3R1ZHlkb3RlOnN0dWR5ZG90ZTEyMw=='};

var response = await post(Urls.getToken,
        headers: headers,
        body: {"grant_type":"password","username":"******","password":"*****","scope":"offline_access"},
      );

执行此操作时，我无法接收数据，并且抛出的错误是

When I execute this I am unable to recieve data and the error thrown is

状态错误:无法设置内容类型为"application/json"的请求的正文字段

Bad state: Cannot set the body fields of a Request with content-type "application/json"

推荐答案

您需要将主体包裹在 jsonEncode 中.

You need to wrap the body in jsonEncode.

import 'package:http/http.dart' as http;
import 'dart:convert';

Map<String,String> headers = {'Content-Type':'application/json','authorization':'Basic c3R1ZHlkb3RlOnN0dWR5ZG90ZTEyMw=='};
final msg = jsonEncode({"grant_type":"password","username":"******","password":"*****","scope":"offline_access"});

var response = await post(Urls.getToken,
               headers: headers,
               body: msg,
            );

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