Got at least one data fetching method working; turns out, we can't use a patched LogicStack to get the data

Vendor/EmbedIO-3.5.2/WebSockets/Internal/WebSocketReceiveResult.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace EmbedIO.WebSockets.Internal
+{
+    /// <summary>
+    /// Represents a WS Receive result.
+    /// </summary>
+    internal sealed class WebSocketReceiveResult : IWebSocketReceiveResult
+    {
+        internal WebSocketReceiveResult(int count, Opcode code)
+        {
+            if (count < 0)
+                throw new ArgumentOutOfRangeException(nameof(count));
+
+            Count = count;
+            EndOfMessage = code == Opcode.Close;
+            MessageType = code == Opcode.Text ? 0 : 1;
+        }
+
+        /// <inheritdoc />
+        public int Count { get; }
+        
+        /// <inheritdoc />
+        public bool EndOfMessage { get; }
+        
+        /// <inheritdoc />
+        public int MessageType { get; }
+    }
+}