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/HttpContextExtensions-Items.cs

@@ -0,0 +1,47 @@
+using System;
+
+namespace EmbedIO
+{
+    partial class HttpContextExtensions
+    {
+        /// <summary>Gets the item associated with the specified key.</summary>
+        /// <typeparam name="T">The desired type of the item.</typeparam>
+        /// <param name="this">The <see cref="IHttpContext"/> on which this method is called.</param>
+        /// <param name="key">The key whose value to get from the <see cref="IHttpContext.Items">Items</see> dictionary.</param>
+        /// <param name="value">
+        /// <para>When this method returns, the item associated with the specified key,
+        /// if the key is found in <see cref="IHttpContext.Items">Items</see>
+        /// and the associated value is of type <typeparamref name="T"/>;
+        /// otherwise, the default value for <typeparamref name="T"/>.</para>
+        /// <para>This parameter is passed uninitialized.</para>
+        /// </param>
+        /// <returns><see langword="true"/> if the item is found and is of type <typeparamref name="T"/>;
+        /// otherwise, <see langword="false"/>.</returns>
+        /// <exception cref="NullReferenceException"><paramref name="this"/> is <see langword="null"/>.</exception>
+        /// <exception cref="ArgumentNullException"><paramref name="key"/> is <see langword="null"/>.</exception>
+        public static bool TryGetItem<T>(this IHttpContext @this, object key, out T value)
+        {
+            if (@this.Items.TryGetValue(key, out var item) && item is T typedItem)
+            {
+                value = typedItem;
+                return true;
+            }
+
+#pragma warning disable CS8653 // value is non-nullable - We are returning false, so value is undefined.
+            value = default;
+#pragma warning restore CS8653
+            return false;
+        }
+
+        /// <summary>Gets the item associated with the specified key.</summary>
+        /// <typeparam name="T">The desired type of the item.</typeparam>
+        /// <param name="this">The <see cref="IHttpContext"/> on which this method is called.</param>
+        /// <param name="key">The key whose value to get from the <see cref="IHttpContext.Items">Items</see> dictionary.</param>
+        /// <returns>The item associated with the specified key,
+        /// if the key is found in <see cref="IHttpContext.Items">Items</see>
+        /// and the associated value is of type <typeparamref name="T"/>;
+        /// otherwise, the default value for <typeparamref name="T"/>.</returns>
+        public static T GetItem<T>(this IHttpContext @this, object key)
+            => @this.Items.TryGetValue(key, out var item) && item is T typedItem ? typedItem : default;
+    }
+}