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.cs

@@ -0,0 +1,30 @@
+using System;
+using EmbedIO.Utilities;
+using Swan;
+
+namespace EmbedIO
+{
+    /// <summary>
+    /// Provides extension methods for types implementing <see cref="IHttpContext"/>.
+    /// </summary>
+    public static partial class HttpContextExtensions
+    {
+        /// <summary>
+        /// <para>Gets the underlying <see cref="IHttpContextImpl"/> interface of an <see cref="IHttpContext"/>.</para>
+        /// <para>This API mainly supports the EmbedIO infrastructure; it is not intended to be used directly from your code,
+        /// unless to fulfill very specific needs in the development of plug-ins (modules, etc.) for EmbedIO.</para>
+        /// </summary>
+        /// <param name="this">The <see cref="IHttpContext"/> interface on which this method is called.</param>
+        /// <returns>The underlying <see cref="IHttpContextImpl"/> interface representing
+        /// the HTTP context implementation.</returns>
+        /// <exception cref="ArgumentNullException">
+        /// <paramref name="this"/> is <see langword="null"/>.
+        /// </exception>
+        /// <exception cref="EmbedIOInternalErrorException">
+        /// <paramref name="this"/> does not implement <see cref="IHttpContextImpl"/>.
+        /// </exception>
+        public static IHttpContextImpl GetImplementation(this IHttpContext @this)
+            => Validate.NotNull(nameof(@this), @this) as IHttpContextImpl
+            ?? throw SelfCheck.Failure($"{@this.GetType().FullName} does not implement {nameof(IHttpContextImpl)}.");
+    }
+}