flutter http post请求返回html而不是json

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

// 发起POST请求
Future<void> sendPostRequest() async {
  var url = Uri.parse('http://example.com/api/endpoint');
  var response = await http.post(url, body: {'key': 'value'});
  print('Response: ${response.body}');
}

import 'package:html/parser.dart' as parser;
import 'package:http/http.dart' as http;

// 发起POST请求并解析HTML响应
Future<void> sendPostRequestAndParseHTML() async {
  var url = Uri.parse('http://example.com/api/endpoint');
  var response = await http.post(url, body: {'key': 'value'});
  
  // 解析HTML响应
  var document = parser.parse(response.body);
  var pageTitle = document.querySelector('title').text;
  print('Page title: $pageTitle');
}