我正在嘗試通過(guò) Amazon SNS 向移動(dòng)設(shè)備發(fā)送遠(yuǎn)程通知。我有一個(gè)數(shù)據(jù)庫(kù)，用于存儲(chǔ)需要提供給 SNS 的 PublishRequest 的 JSON（有效負(fù)載）。我在代碼中序列化 json 并將其傳遞給請(qǐng)求。問(wèn)題是 SNS 失敗并顯示錯(cuò)誤：“MESSAGE STRUCTURE - JSON MESSAGE BODY FAILED TO PARSE”作為一項(xiàng)要求，服務(wù)（負(fù)責(zé)與 SNS 通信并發(fā)送通知）必須從 DB (MySQL) 檢索 json。我缺少什么？數(shù)據(jù)庫(kù)是MySQL，服務(wù)是用.Net Core編寫的string messageFromDb = JsonConvert.SerializeObject(input.Payload);var request = new PublishRequest{    TargetArn = endpoint.EndpointArn,    MessageStructure = "json",    Message = messageFromDb};PublishResponse publishResponse = await _client.PublishAsync(request);來(lái)自數(shù)據(jù)庫(kù)的 JSON：{"APNS": {"aps": {"alert": "Check out the new!", "sound": "default"}, "category": {"type": "sports"}}}我也試過(guò)這個(gè)沒(méi)有任何運(yùn)氣：{"default": "something", "APNS": {"aps": {"alert": "Check out the new games!", "sound": "default"}, "game": {"type": "Xbox"}}}