--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_rest/apidemo.lib.lua	Tue Mar 02 18:38:13 2021 +0100
@@ -0,0 +1,44 @@
+
+local _M = {};
+
+local api_demo = module:get_option_path("rest_demo_resources", nil);
+local http_files = require "net.http.files";
+
+local mime_map = module:shared("/*/http_files/mime").types or {css = "text/css"; js = "application/javascript"};
+_M.resources = http_files.serve({
+		path = api_demo;
+		mime_map = mime_map;
+	});
+
+local index do
+	local f = assert(io.open(api_demo.."/index.html"), "'api_demo_resources' should point to the 'dist' directory");
+	index = f:read("*a");
+	f:close();
+
+	-- SUCH HACK, VERY GSUB, WOW!
+	index = index:gsub("(%s?url%s*:%s*)%b\"\"", string.format("%%1%q", module:http_url().."/demo/openapi.yaml"), 1);
+end
+
+do
+	local f = module:load_resource("openapi.yaml");
+	_M.schema = {
+		body = f:read("*a");
+	}
+	f:close();
+end
+
+_M.redirect = {
+	status_code = 303;
+	headers = {
+		location = module:http_url().."/demo/";
+	};
+};
+
+_M.main_page = {
+	headers = {
+		content_type = "text/html";
+	};
+	body = index;
+}
+
+return _M

--- a/mod_rest/mod_rest.lua	Tue Mar 02 18:35:54 2021 +0100
+++ b/mod_rest/mod_rest.lua	Tue Mar 02 18:38:13 2021 +0100
@@ -309,6 +309,11 @@
 	end
 end
 
+local demo_handlers = {};
+if module:get_option_path("rest_demo_resources", nil) then
+	demo_handlers = module:require"apidemo";
+end
+
 -- Handle stanzas submitted via HTTP
 module:depends("http");
 module:provides("http", {
@@ -316,6 +321,12 @@
 			POST = handle_request;
 			["POST /*"] = handle_request;
 			["GET /*"] = handle_request;
+
+			-- Only if api_demo_resources are set
+			["GET /"] = demo_handlers.redirect;
+			["GET /demo/"] = demo_handlers.main_page;
+			["GET /demo/openapi.yaml"] = demo_handlers.schema;
+			["GET /demo/*"] = demo_handlers.resources;
 		};
 	});