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/Actions/ActionModule.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Threading.Tasks;
+using EmbedIO.Utilities;
+
+namespace EmbedIO.Actions
+{
+    /// <summary>
+    /// A module that passes requests to a callback.
+    /// </summary>
+    /// <seealso cref="WebModuleBase" />
+    public class ActionModule : WebModuleBase
+    {
+        private readonly HttpVerbs _verb;
+
+        private readonly RequestHandlerCallback _handler;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ActionModule" /> class.
+        /// </summary>
+        /// <param name="baseRoute">The base route.</param>
+        /// <param name="verb">The HTTP verb that will be served by this module.</param>
+        /// <param name="handler">The callback used to handle requests.</param>
+        /// <exception cref="ArgumentNullException"><paramref name="handler"/> is <see langword="null"/>.</exception>
+        /// <seealso cref="WebModuleBase(string)"/>
+        public ActionModule(string baseRoute, HttpVerbs verb, RequestHandlerCallback handler)
+            : base(baseRoute)
+        {
+            _verb = verb;
+            _handler = Validate.NotNull(nameof(handler), handler);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ActionModule"/> class.
+        /// </summary>
+        /// <param name="handler">The handler.</param>
+        public ActionModule(RequestHandlerCallback handler)
+            : this("/", HttpVerbs.Any, handler)
+        {
+        }
+
+        /// <inheritdoc />
+        public override bool IsFinalHandler => false;
+
+        /// <inheritdoc />
+        protected override async Task OnRequestAsync(IHttpContext context)
+        {
+            if (_verb != HttpVerbs.Any && context.Request.HttpVerb != _verb)
+                return;
+
+            await _handler(context).ConfigureAwait(false);
+            context.SetHandled();
+        }
+    }
+}

Vendor/EmbedIO-3.5.2/Actions/RedirectModule.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Net;
+using System.Threading.Tasks;
+using EmbedIO.Utilities;
+
+namespace EmbedIO.Actions
+{
+    /// <summary>
+    /// A module that redirects requests.
+    /// </summary>
+    /// <seealso cref="WebModuleBase" />
+    public class RedirectModule : WebModuleBase
+    {
+        private readonly Func<IHttpContext, bool>? _shouldRedirect;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RedirectModule"/> class
+        /// that will redirect all served requests.
+        /// </summary>
+        /// <param name="baseRoute">The base route.</param>
+        /// <param name="redirectUrl">The redirect URL.</param>
+        /// <param name="statusCode">The response status code; default is <c>302 - Found</c>.</param>
+        /// <exception cref="ArgumentNullException"><paramref name="redirectUrl"/> is <see langword="null"/>.</exception>
+        /// <exception cref="ArgumentException">
+        /// <para><paramref name="redirectUrl"/> is not a valid URL.</para>
+        /// <para>- or -</para>
+        /// <para><paramref name="statusCode"/> is not a redirection (3xx) status code.</para>
+        /// </exception>
+        /// <seealso cref="WebModuleBase(string)"/>
+        public RedirectModule(string baseRoute, string redirectUrl, HttpStatusCode statusCode = HttpStatusCode.Found)
+            : this(baseRoute, redirectUrl, null, statusCode, false)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RedirectModule"/> class
+        /// that will redirect all requests for which the <paramref name="shouldRedirect"/> callback
+        /// returns <see langword="true"/>.
+        /// </summary>
+        /// <param name="baseRoute">The base route.</param>
+        /// <param name="redirectUrl">The redirect URL.</param>
+        /// <param name="shouldRedirect">A callback function that returns <see langword="true"/>
+        /// if a request must be redirected.</param>
+        /// <param name="statusCode">The response status code; default is <c>302 - Found</c>.</param>
+        /// <exception cref="ArgumentNullException">
+        /// <para><paramref name="redirectUrl"/> is <see langword="null"/>.</para>
+        /// <para>- or -</para>
+        /// <para><paramref name="shouldRedirect"/> is <see langword="null"/>.</para>
+        /// </exception>
+        /// <exception cref="ArgumentException">
+        /// <para><paramref name="redirectUrl"/> is not a valid URL.</para>
+        /// <para>- or -</para>
+        /// <para><paramref name="statusCode"/> is not a redirection (3xx) status code.</para>
+        /// </exception>
+        /// <seealso cref="WebModuleBase(string)"/>
+        public RedirectModule(string baseRoute, string redirectUrl, Func<IHttpContext, bool>? shouldRedirect, HttpStatusCode statusCode = HttpStatusCode.Found)
+            : this(baseRoute, redirectUrl, shouldRedirect, statusCode, true)
+        {
+        }
+
+        private RedirectModule(string baseRoute, string redirectUrl, Func<IHttpContext, bool>? shouldRedirect, HttpStatusCode statusCode, bool useCallback)
+            : base(baseRoute)
+        {
+            RedirectUrl = Validate.Url(nameof(redirectUrl), redirectUrl);
+
+            var status = (int)statusCode;
+            if (status < 300 || status > 399)
+                throw new ArgumentException("Status code does not imply a redirection.", nameof(statusCode));
+
+            StatusCode = statusCode;
+            _shouldRedirect = useCallback ? Validate.NotNull(nameof(shouldRedirect), shouldRedirect) : null;
+        }
+
+        /// <inheritdoc />
+        public override bool IsFinalHandler => false;
+
+        /// <summary>
+        /// Gets the redirect URL.
+        /// </summary>
+        public string RedirectUrl { get; }
+
+        /// <summary>
+        /// Gets the response status code.
+        /// </summary>
+        public HttpStatusCode StatusCode { get; }
+
+        /// <inheritdoc />
+        protected override Task OnRequestAsync(IHttpContext context)
+        {
+            if (_shouldRedirect?.Invoke(context) ?? true)
+            {
+                context.Redirect(RedirectUrl, (int)StatusCode);
+                context.SetHandled();
+            }
+
+            return Task.CompletedTask;
+        }
+    }
+}