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/IWebModule.cs

@@ -0,0 +1,81 @@
+using System.Threading;
+using System.Threading.Tasks;
+using EmbedIO.Routing;
+
+namespace EmbedIO
+{
+    /// <summary>
+    /// Represents a module.
+    /// </summary>
+    public interface IWebModule
+    {
+        /// <summary>
+        /// Gets the base route of a module.
+        /// </summary>
+        /// <value>
+        /// The base route.
+        /// </value>
+        /// <remarks>
+        /// <para>A base route is either "/" (the root path),
+        /// or a prefix starting and ending with a '/' character.</para>
+        /// </remarks>
+        string BaseRoute { get; }
+
+        /// <summary>
+        /// Gets a value indicating whether processing of a request should stop
+        /// after a module has handled it.
+        /// </summary>
+        /// <remarks>
+        /// <para>If this property is <see langword="true" />, a HTTP context's
+        /// <see cref="IHttpContext.SetHandled" /> method will be automatically called
+        /// immediately after after the <see cref="Task" /> returned by
+        /// <see cref="HandleRequestAsync" /> is completed. This will prevent
+        /// the context from being passed further along to other modules.</para>
+        /// </remarks>
+        /// <seealso cref="IHttpContext.IsHandled" />
+        /// <seealso cref="IHttpContext.SetHandled" />
+        bool IsFinalHandler { get; }
+
+        /// <summary>
+        /// <para>Gets or sets a callback that is called every time an unhandled exception
+        /// occurs during the processing of a request.</para>
+        /// <para>If this property is <see langword="null"/> (the default),
+        /// the exception will be handled by the web server, or by the containing
+        /// <see cref="ModuleGroup"/>.</para>
+        /// </summary>
+        /// <seealso cref="ExceptionHandler"/>
+        ExceptionHandlerCallback? OnUnhandledException { get; set; }
+
+        /// <summary>
+        /// <para>Gets or sets a callback that is called every time a HTTP exception
+        /// is thrown during the processing of a request.</para>
+        /// <para>If this property is <see langword="null"/> (the default),
+        /// the exception will be handled by the web server, or by the containing
+        /// <see cref="ModuleGroup"/>.</para>
+        /// </summary>
+        /// <seealso cref="HttpExceptionHandler"/>
+        HttpExceptionHandlerCallback? OnHttpException { get; set; }
+
+        /// <summary>
+        /// Signals a module that the web server is starting.
+        /// </summary>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> used to stop the web server.</param>
+        void Start(CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Matches the specified URL path against a module's <see cref="BaseRoute"/>,
+        /// extracting values for the route's parameters and a sub-path.
+        /// </summary>
+        /// <param name="urlPath">The URL path to match.</param>
+        /// <returns>If the match is successful, a <see cref="RouteMatch"/> object;
+        /// otherwise, <see langword="null"/>.</returns>
+        RouteMatch MatchUrlPath(string urlPath);
+
+        /// <summary>
+        /// Handles a request from a client.
+        /// </summary>
+        /// <param name="context">The context of the request being handled.</param>
+        /// <returns>A <see cref="Task" /> representing the ongoing operation.</returns>
+        Task HandleRequestAsync(IHttpContext context);
+    }
+}