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我正在尝试实现类似于此 python 示例的应用程序同步订阅，但在 .net https://aws.amazon.com/blogs/mobile/appsync-websockets-python/

我使用 nuget 包 GraphQL.Client https://www.nuget.org/packages/GraphQL.Client开始执行此 操作，查询/突变的执行工作正常，如https://github.com/graphql-的自述文件中给出的那样dotnet/graphql-client 但订阅不起作用。

我使用 GraphQL.Client 的代码：

using var graphQLClient = new GraphQLHttpClient("https://<MY-API-PATH>.appsync-realtime-api.<AWS-region>.amazonaws.com/graphql", new NewtonsoftJsonSerializer());

 graphQLClient.HttpClient.DefaultRequestHeaders.Add("host", "<API HOST without https or absolute path and 'realtime-' text in the api address>"); //As given in the python example

graphQLClient.HttpClient.DefaultRequestHeaders.Add("x-api-key", "<API KEY>");
var req= new GraphQLRequest
{
    Query = @"subscription SubscribeToEventComments{ subscribeToEventComments(eventId: 'test'){  content }}",
    Variables = new{}
};

IObservable<GraphQLResponse<Response>> subscriptionStream = graphQLClient.CreateSubscriptionStream<Response>(req, (Exception ex) =>
{
      Console.WriteLine("Error: {0}", ex.ToString());
});

var subscription …