如何重试api请求一旦refreshtoken api被调用?

Question

我在dart中使用http拦截器来处理refreshtoken，在使用三个拦截器调用refreshtoken api并获得新的accesstoken后，我如何再次调用api请求?

class ExpiredTokenRetryPolicy extends RetryPolicy {
@override
Future<bool> shouldAttemptRetryOnResponse(ResponseData response) async {
if (response.statusCode == 401) {
await GetFitbitAccessToken().getAccessToken();
return true;
}
return false;
}
}

------------------------------------
Client client = InterceptedClient.build(
interceptors: [
FitbitApiInterceptor(),
],
retryPolicy: ExpiredTokenRetryPolicy(),
);

Answer 1

基本上你需要错误401(未经授权)并不一定意味着令牌已经过期，所以我认为你应该有一个刷新令牌来处理这种情况。如果你的API有一个刷新令牌，那么这样做。

class ExpiredTokenRetryPolicy extends RetryPolicy {
@override
Future<bool> shouldAttemptRetryOnResponse(ResponseData response) async {
if (response.statusCode == 200) {
// do your normal request
return true;
}else if(response.statusCode =401){
//for POST
///within the header add this
headers: {'grant_type': 'refresh_token', 'refresh_token': 
'$refresh_token'});
token = jsonDecode(response.body)['token'];
refresh_token = jsonDecode(response.body)['refresh_token'];
return true;
}
return false;
}
}