[fix] decode path only once to fix loading unicode routes

Author: benmccann

.changeset/brave-seas-invent.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-node': patch
+---
+
+[fix] decode path only once to fix loading unicode routes

packages/adapter-node/package.json

@@ -25,6 +25,7 @@
 		"tiny-glob": "^0.2.9"
 	},
 	"devDependencies": {
+		"@polka/url": "^1.0.0-next.15",
 		"@rollup/plugin-json": "^4.1.0",
 		"@sveltejs/kit": "workspace:*",
 		"c8": "^7.7.2",

packages/adapter-node/src/server.js

@@ -3,6 +3,7 @@ import compression from 'compression';
 import fs from 'fs';
 import { dirname, join } from 'path';
 import polka from 'polka';
+import { parse } from '@polka/url';
 import sirv from 'sirv';
 import { fileURLToPath } from 'url';
 
@@ -38,7 +39,13 @@ export function createServer({ render }) {
 		  })
 		: noop_handler;
 
-	const server = polka().use(
+	const server = polka();
+	// Polka has a non-standard behavior of decoding the request path
+	// Disable it so that we don't double-decode. SvelteKit will handle decoding
+	server.parse = (req) => {
+		return parse(req, false);
+	};
+	server.use(
 		compression({ threshold: 0 }),
 		assets_handler,
 		prerendered_handler,