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/HttpResponseExtensions.cs

@@ -0,0 +1,43 @@
+using System;
+using EmbedIO.Utilities;
+
+namespace EmbedIO
+{
+    /// <summary>
+    /// Provides extension methods for types implementing <see cref="IHttpResponse"/>.
+    /// </summary>
+    public static class HttpResponseExtensions
+    {
+        /// <summary>
+        /// Sets the necessary headers to disable caching of a response on the client side.
+        /// </summary>
+        /// <param name="this">The <see cref="IHttpResponse"/> interface on which this method is called.</param>
+        /// <exception cref="NullReferenceException"><paramref name="this"/> is <see langword="null"/>.</exception>
+        public static void DisableCaching(this IHttpResponse @this)
+        {
+            var headers = @this.Headers;
+            headers.Set(HttpHeaderNames.Expires, "Sat, 26 Jul 1997 05:00:00 GMT");
+            headers.Set(HttpHeaderNames.LastModified, HttpDate.Format(DateTime.UtcNow));
+            headers.Set(HttpHeaderNames.CacheControl, "no-store, no-cache, must-revalidate");
+            headers.Add(HttpHeaderNames.Pragma, "no-cache");
+        }
+
+        /// <summary>
+        /// Prepares a standard response without a body for the specified status code.
+        /// </summary>
+        /// <param name="this">The <see cref="IHttpResponse"/> interface on which this method is called.</param>
+        /// <param name="statusCode">The HTTP status code of the response.</param>
+        /// <exception cref="NullReferenceException"><paramref name="this"/> is <see langword="null"/>.</exception>
+        /// <exception cref="ArgumentException">There is no standard status description for <paramref name="statusCode"/>.</exception>
+        public static void SetEmptyResponse(this IHttpResponse @this, int statusCode)
+        {
+            if (!HttpStatusDescription.TryGet(statusCode, out var statusDescription))
+                throw new ArgumentException("Status code has no standard description.", nameof(statusCode));
+
+            @this.StatusCode = statusCode;
+            @this.StatusDescription = statusDescription;
+            @this.ContentType = MimeType.Default;
+            @this.ContentEncoding = null;
+        }
+    }
+}