我目前正在尝试访问 Flutter 中的 Web API,该 API 需要 JWT 访问令牌进行授权。访问令牌会在一段时间后过期。
可以使用单独的刷新令牌来请求新的访问令牌。现在,一旦请求返回 401 响应,就会执行此访问令牌刷新。之后,应使用新的访问令牌重试失败的请求.
我在最后一步遇到了麻烦。这似乎是一个http.BaseRequest
只能发送一次。如何使用新令牌重试 http 请求?
正如建议的飞镖 http 自述文件 https://github.com/dart-lang/http#using,我创建了一个子类http.BaseClient
添加授权行为。这是一个简化版本:
import 'dart:async';
import 'package:http/http.dart' as http;
class AuthorizedClient extends http.BaseClient {
AuthorizedClient(this._authService) : _inner = http.Client();
final http.Client _inner;
final AuthService _authService;
Future<http.StreamedResponse> send(http.BaseRequest request) async {
final token = await _authService.getAccessToken();
request.headers['Authorization'] = 'Bearer $token';
final response = await _inner.send(request);
if (response.statusCode == 401) {
final newToken = await _authService.refreshAccessToken();
request.headers['Authorization'] = 'Bearer $newToken';
// throws error: Bad state: Can't finalize a finalized Request
final retryResponse = await _inner.send(request);
return retryResponse;
}
return response;
}
}
abstract class AuthService {
Future<String> getAccessToken();
Future<String> refreshAccessToken();
}
这是我到目前为止根据理查德·希普的回答得出的结论:要重新发送请求,我们必须复制它。
到目前为止我还无法找到流请求的解决方案!
http.BaseRequest _copyRequest(http.BaseRequest request) {
http.BaseRequest requestCopy;
if(request is http.Request) {
requestCopy = http.Request(request.method, request.url)
..encoding = request.encoding
..bodyBytes = request.bodyBytes;
}
else if(request is http.MultipartRequest) {
requestCopy = http.MultipartRequest(request.method, request.url)
..fields.addAll(request.fields)
..files.addAll(request.files);
}
else if(request is http.StreamedRequest) {
throw Exception('copying streamed requests is not supported');
}
else {
throw Exception('request type is unknown, cannot copy');
}
requestCopy
..persistentConnection = request.persistentConnection
..followRedirects = request.followRedirects
..maxRedirects = request.maxRedirects
..headers.addAll(request.headers);
return requestCopy;
}
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