diff --git a/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md b/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
index 969854de3a..d9d39544e5 100644
--- a/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
+++ b/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
@@ -96,7 +96,7 @@ async (getUserInput) => {
   const res = await fetch(url + '/api/shorturl', {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `url=ftp:/john-doe.org`
+    body: `url=ftp:/john-doe.invalidTLD`
   });
   if (res.ok) {
     const { error } = await res.json();
diff --git a/curriculum/challenges/chinese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md b/curriculum/challenges/chinese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
index 0e6c78b124..5b017c2192 100644
--- a/curriculum/challenges/chinese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
+++ b/curriculum/challenges/chinese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
@@ -96,7 +96,7 @@ async (getUserInput) => {
   const res = await fetch(url + '/api/shorturl', {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `url=ftp:/john-doe.org`
+    body: `url=ftp:/john-doe.invalidTLD`
   });
   if (res.ok) {
     const { error } = await res.json();
diff --git a/curriculum/challenges/espanol/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md b/curriculum/challenges/espanol/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
index 1615bc610b..69c796ebe9 100644
--- a/curriculum/challenges/espanol/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
+++ b/curriculum/challenges/espanol/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
@@ -96,7 +96,7 @@ async (getUserInput) => {
   const res = await fetch(url + '/api/shorturl', {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `url=ftp:/john-doe.org`
+    body: `url=ftp:/john-doe.invalidTLD`
   });
   if (res.ok) {
     const { error } = await res.json();
diff --git a/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md b/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
index 3c7499170b..0fa6ebe37b 100644
--- a/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
+++ b/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
@@ -30,7 +30,7 @@ Quando hai finito, assicurati che una demo funzionante del tuo progetto sia ospi
 };
 ```
 
-Una richiesta a `/api/:date?` con una data valida dovrebbe restituire un oggetto JSON con una chiave `unix` che è il tempo Unix in millisecondi della data di input
+Una richiesta a `/api/:date?` con una data valida dovrebbe restituire un oggetto JSON con una chiave `unix` che è un timestamp Unix della data di input in millisecondi (di tipo Number)
 
 ```js
 (getUserInput) =>
diff --git a/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md b/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
index e7b15c4954..70ef751ea1 100644
--- a/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
+++ b/curriculum/challenges/italian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
@@ -96,7 +96,7 @@ async (getUserInput) => {
   const res = await fetch(url + '/api/shorturl', {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `url=ftp:/john-doe.org`
+    body: `url=ftp:/john-doe.invalidTLD`
   });
   if (res.ok) {
     const { error } = await res.json();
diff --git a/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md b/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
index f1185525c4..37c5c9d87c 100644
--- a/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
+++ b/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
@@ -96,7 +96,7 @@ async (getUserInput) => {
   const res = await fetch(url + '/api/shorturl', {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `url=ftp:/john-doe.org`
+    body: `url=ftp:/john-doe.invalidTLD`
   });
   if (res.ok) {
     const { error } = await res.json();
diff --git a/curriculum/challenges/portuguese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md b/curriculum/challenges/portuguese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
index 298bdc2617..68c33b22bf 100644
--- a/curriculum/challenges/portuguese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
+++ b/curriculum/challenges/portuguese/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
@@ -96,7 +96,7 @@ async (getUserInput) => {
   const res = await fetch(url + '/api/shorturl', {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `url=ftp:/john-doe.org`
+    body: `url=ftp:/john-doe.invalidTLD`
   });
   if (res.ok) {
     const { error } = await res.json();
diff --git a/curriculum/challenges/ukrainian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md b/curriculum/challenges/ukrainian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
index 63b48c1f3a..0eca39a43e 100644
--- a/curriculum/challenges/ukrainian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
+++ b/curriculum/challenges/ukrainian/05-back-end-development-and-apis/back-end-development-and-apis-projects/url-shortener-microservice.md
@@ -96,7 +96,7 @@ async (getUserInput) => {
   const res = await fetch(url + '/api/shorturl', {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `url=ftp:/john-doe.org`
+    body: `url=ftp:/john-doe.invalidTLD`
   });
   if (res.ok) {
     const { error } = await res.json();