Remove trailing slash on urls

astro.config.ts

@@ -11,6 +11,7 @@ export default defineConfig({
   srcDir: "./src",
   publicDir: "./public",
   outDir: "./dist",
+  trailingSlash: "never",
   adapter: node({
     mode: "standalone",
   }),

src/middleware.ts

@@ -7,11 +7,13 @@ import { actionsHandlingMiddleware } from "src/middleware/actionsHandling";
 import { requestTrackingMiddleware } from "src/middleware/requestTracking";
 import { pageCachingMiddleware } from "src/middleware/pageCaching";
 import { setAstroLocalsMiddleware } from "src/middleware/setAstroLocals";
+import { removeTrailingSlashMiddleware } from "src/middleware/removeTrailingSlash";
 
 export const onRequest = sequence(
   // Possible redirect
   actionsHandlingMiddleware,
   localeNegotiationMiddleware,
+  removeTrailingSlashMiddleware,
 
   addCommonHeadersMiddleware,
 

src/middleware/removeTrailingSlash.ts

@@ -0,0 +1,10 @@
+import { defineMiddleware } from "astro:middleware";
+import { redirect } from "src/middleware/utils";
+
+export const removeTrailingSlashMiddleware = defineMiddleware(({ url }, next) => {
+  if (url.pathname.endsWith("/")) {
+    url.pathname = url.pathname.substring(0, url.pathname.length - 1);
+    return redirect(url.toString());
+  }
+  return next();
+});