fix: normalised based path

src/build.ts

@@ -96,7 +96,7 @@ await rebuild();
 
 if (flags.dev) {
 	const watcher = Deno.watchFs(site_dir);
-	serve(create_handler({ base: flags.base, build_dir }), { port: 4507 });
+	serve(create_handler({ base_path, build_dir }), { port: 4507 });
 	let timeout;
 	for await (const { kind, paths: [path] } of watcher) {
 		if (path && (kind === "modify" || kind === "create")) {

src/server.ts

@@ -1,19 +1,24 @@
 import { Handler } from "https://deno.land/[email protected]/http/server.ts";
 import { serveDir } from "https://deno.land/[email protected]/http/file_server.ts";
+import { normalize as normalise } from "https://deno.land/[email protected]/path/posix.ts";
 
 interface ServerOptions {
-	base?: string;
+	base_path: string;
 	build_dir: string;
 }
 
 export const create_handler = (
-	{ base = "", build_dir }: ServerOptions,
+	{ base_path, build_dir }: ServerOptions,
 ): Handler => ((req) => {
 	const url = new URL(req.url);
 
-	if (url.pathname.startsWith("/" + base)) {
-		return serveDir(req, { fsRoot: build_dir, urlRoot: base });
+	const normalised_base_path = normalise("/" + base_path + "/");
+
+	if (url.pathname.startsWith(normalised_base_path)) {
+		return serveDir(req, { fsRoot: build_dir, urlRoot: base_path });
 	} else {
-		return Response.redirect(new URL(base + url.pathname, url.origin));
+		return Response.redirect(
+			new URL(normalise(normalised_base_path + url.pathname), url.origin),
+		);
 	}
 });