Flutter Dio 无法发出 POST 请求 [关闭]

Posted 2023-02-19

【中文标题】Flutter Dio 无法发出 POST 请求 [关闭]

【英文标题】：Flutter Dio Can't Make POST Requests [closed]

【发布时间】：2020-06-22 02:01:09

【问题描述】：

我正在尝试使用 Dio 插件在 Flutter 应用程序中执行 POST 请求。我有以下代码，但我似乎不知道为什么它不起作用。它将空数据发送到我的 API。

代码：

Future<String> sendRequest(String phone, int status) async 
String status = '';
print(sendConnectionUrl);
String bearerToken = await Endpoints.getBearerToken();

try 
  Response response = await Dio().post(
    'https://my.web.server/api',
    data: json.encode( "mobile": phone, "status": status ),
    options: Options(
      headers: 
        'Accept': 'application/json',
        'Authorization': 'Bearer ' + bearerToken
      
    )
  );

  // The code doesnt even get here, it goes straight to the catch
  print(response.toString());
  print('status: ' + response.statusCode.toString());
  var jsonData = json.decode(response.toString());
  if (jsonData['error'] == '0') 
    status = 'ok';
  
  else 
    status = 'failed';
  

catch (e) 
  print('exception: ' + e.toString());
  Future.error(e.toString());


return status;

但是在 POSTMAN 中发送请求是可行的。

【参考方案1】：

这意味着您的服务器期待 formData 并且您正在通过 data 参数发送数据。据我所知 Dio 不支持 formData 。要解决这个问题，您应该更改您的 API 以适应此要求或使用 httppackage here

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

var url = 'https://example.com/whatsit/create';
var response = await http.post(url, body: 'name': 'doodle', 'color': 'blue');
print('Response status: $response.statusCode');
print('Response body: $response.body');

print(await http.read('https://example.com/foobar.txt'));

【参考方案2】：

试试这个：

Future<String> sendRequest(String phone, int status) async 
String status = '';
print(sendConnectionUrl);
String bearerToken = await Endpoints.getBearerToken();
Formdata form=FormData.fromMap(
"mobile": phone, "status": status
)

try 
  Response response = await Dio().post(
    'https://my.web.server/api',
    data: form,
    options: Options(
      headers: 
        'Accept': 'application/json',
        'Authorization': 'Bearer ' + bearerToken
      
    )
  );

  // The code doesnt even get here, it goes straight to the catch
  print(response.toString());
  print('status: ' + response.statusCode.toString());
  var jsonData = json.decode(response.toString());
  if (jsonData['error'] == '0') 
    status = 'ok';
  
  else 
    status = 'failed';
  

catch (e) 
  print('exception: ' + e.toString());
  Future.error(e.toString());


return status;

【参考方案3】：

试试这个

FormData form = FormData.fromMap("url": url);
Response response = await (Dio()).post(requestUrl, data: form, cancelToken: token);