dart - Flutter-如何以这种格式发布 https？

Question

我想在 Dart 中发送 post 请求。 curl 看起来像这样。

curl -X POST "https://api-us.faceplusplus.com/facepp/v3/search" \
-F "api_key=<api_key>" \
-F "api_secret=<api_secret>" \
-F "face_token=c2fc0ad7c8da3af5a34b9c70ff764da0" \
-F "outer_id=facesetid"

我试过这样但是错误响应说

MISSING_ARGUMENTS: api_key

final String apiKey = API_KEY;
final String apiSecret = API_SECRET;
final String faceToken = FACE_TOKEN;
final String outerId = OUTER_ID;

final data = jsonEncode({
 'api_key': apiKey,
 'api_secret': apiSecret,
 'face_token': faceToken, 
 'outer_id': outerId
});

final http.Response request = await http.post(
  'https://api-us.faceplusplus.com/facepp/v3/search',
  body: data,
);


final String response = request.body;
final result = json.decode(response);
print(response);
print('------------------------');
print(result);

我错过了什么？
我怎样才能正确发布这个？

Answer 1

来自 man curl

 -F, --form <name=content>
              (HTTP) This lets curl emulate a filled-in form in which a user has pressed the submit button. This causes curl to POST data using the  Content-Type  multipart/form-data

https://pub.dartlang.org/documentation/http/latest/http/MultipartRequest-class.html

var uri = Uri.parse("http://pub.dartlang.org/packages/create");
var request = new http.MultipartRequest("POST", url);
request.fields['user'] = 'nweiz@google.com';
request.files.add(new http.MultipartFile.fromFile(
    'package',
    new File('build/package.tar.gz'),
    contentType: new MediaType('application', 'x-tar'));
request.send().then((response) {
  if (response.statusCode == 200) print("Uploaded!");
});