相关疑难解决方法(0)

如何使用控制台dart应用程序执行HTTP POST(使用dart:io或可能是package:http库.我这样做:

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

  http.post(
    url,
    headers: {HttpHeaders.CONTENT_TYPE: "application/json"},
    body: {"foo": "bar"})
      .then((response) {
        print("Response status: ${response.statusCode}");
        print("Response body: ${response.body}");
      }).catchError((err) {
        print(err);
      });

但是得到以下错误:

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