Add a first cut at an express-based backend

express/handlers.ts

@@ -0,0 +1,19 @@
+import { contentTypes } from "./content-types";
+import { httpCodes } from "./http-codes";
+import { services } from "./services";
+import { Call, Handler, Result } from "./types";
+
+const multiHandler: Handler = async (call: Call): Promise<Result> => {
+    const code = httpCodes.success.OK;
+    const rn = services.random.randomNumber();
+
+    const retval: Result = {
+        code,
+        result: `that was ${call.method} (${rn})`,
+        contentType: contentTypes.text.plain,
+    };
+
+    return retval;
+};
+
+export { multiHandler };