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/Authentication/BasicAuthenticationModuleExtensions.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace EmbedIO.Authentication
+{
+    /// <summary>
+    /// Provides extension methods for <see cref="BasicAuthenticationModule"/>.
+    /// </summary>
+    public static class BasicAuthenticationModuleExtensions
+    {
+        /// <summary>
+        /// Adds a username and password to the <see cref="BasicAuthenticationModule.Accounts">Accounts</see> dictionary.
+        /// </summary>
+        /// <param name="this">The <see cref="BasicAuthenticationModule"/> on which this method is called.</param>
+        /// <param name="userName">The user name.</param>
+        /// <param name="password">The password.</param>
+        /// <returns><paramref name="this"/>, with the user name and password added.</returns>
+        /// <exception cref="NullReferenceException"><paramref name="this"/> is <see langword="null"/>.</exception>
+        /// <exception cref="ArgumentNullException"><paramref name="userName"/> is <see langword="null"/>.</exception>
+        /// <exception cref="OverflowException">
+        /// <para>The <see cref="BasicAuthenticationModule.Accounts">Accounts</see> dictionary already contains
+        /// the maximum number of elements (<see cref="int.MaxValue">MaxValue</see>).</para>
+        /// </exception>
+        /// <remarks>
+        /// <para>If a <paramref name="userName"/> account already exists,
+        /// its password is replaced with <paramref name="password"/>.</para>
+        /// </remarks>
+        public static BasicAuthenticationModule WithAccount(this BasicAuthenticationModule @this, string userName, string password)
+        {
+            @this.Accounts.AddOrUpdate(userName, password, (_, __) => password);
+
+            return @this;
+        }
+    }
+}