Use Func instead of static object to configure

Author: rose-a

src/GraphQL.Client.Abstractions.Websocket/GraphQLWebSocketRequest.cs

@@ -14,7 +14,7 @@ public class GraphQLWebSocketRequest : Dictionary<string, object>, IEquatable<Gr
         public const string PAYLOAD_KEY = "payload";
 
         /// <summary>
-        /// The Identifier of the Response
+        /// The Identifier of the request
         /// </summary>
         public string Id
         {
@@ -34,7 +34,7 @@ public string Type
         /// <summary>
         /// The payload of the websocket request
         /// </summary>
-        public object Payload
+        public object? Payload
         {
             get => TryGetValue(PAYLOAD_KEY, out object value) ? value : null;
             set => this[PAYLOAD_KEY] = value;

src/GraphQL.Client/GraphQLHttpClientOptions.cs

@@ -61,6 +61,6 @@ public class GraphQLHttpClientOptions
         /// The `ConnectionParams` object sent with the GQL_CONNECTION_INIT message on establishing a websocket connection.
         /// See https://github.com/apollographql/subscriptions-transport-ws/blob/master/PROTOCOL.md#gql_connection_init.
         /// </summary>
-        public object? WebSocketConnectionParams { get; set; } = null;
+        public Func<object?> SetWebSocketConnectionParams { get; set; } = () => null;
     }
 }

src/GraphQL.Client/Websocket/GraphQLHttpWebSocket.cs

@@ -98,12 +98,13 @@ public IObservable<GraphQLResponse<TResponse>> CreateSubscriptionStream<TRespons
                     Observable.Create<GraphQLResponse<TResponse>>(async observer =>
                     {
                         Debug.WriteLine($"Create observable thread id: {Thread.CurrentThread.ManagedThreadId}");
-                        await _client.Options.PreprocessRequest(request, _client);
+                        var preprocessedRequest = await _client.Options.PreprocessRequest(request, _client);
+
                         var startRequest = new GraphQLWebSocketRequest
                         {
                             Id = Guid.NewGuid().ToString("N"),
                             Type = GraphQLWebSocketMessageType.GQL_START,
-                            Payload = request
+                            Payload = preprocessedRequest
                         };
                         var stopRequest = new GraphQLWebSocketRequest
                         {
@@ -114,7 +115,7 @@ public IObservable<GraphQLResponse<TResponse>> CreateSubscriptionStream<TRespons
                         {
                             Id = startRequest.Id,
                             Type = GraphQLWebSocketMessageType.GQL_CONNECTION_INIT,
-                            Payload = Options.WebSocketConnectionParams
+                            Payload = Options.SetWebSocketConnectionParams()
                         };
 
                         var observable = Observable.Create<GraphQLResponse<TResponse>>(o =>