Update app.py

app.py

@@ -338,15 +338,17 @@ def fetch_latest_arxiv_papers(keywords: list, num_results: int = 5) -> list:
         List of the most relevant papers based on TF-IDF ranking.
     """
     try:
-        # ✅ Fetch only 5 papers
-        url = f"http://export.arxiv.org/api/query?search_query={'%20'.join(keywords)}&start=0&max_results=5&sortBy=submittedDate&sortOrder=descending"
-        print(f"DEBUG: Query URL - {url}")
+        # ✅ Correct URL encoding for spaces and special characters
+        query = "+AND+".join([f"all:{kw}" for kw in keywords])
+        query_encoded = urllib.parse.quote_plus(query)  # ✅ FIXED: Correct encoding
+        
+        url = f"http://export.arxiv.org/api/query?search_query={query_encoded}&start=0&max_results=5&sortBy=submittedDate&sortOrder=descending"
+        print(f"DEBUG: Query URL - {url}")  # ✅ Debugging
 
         feed = feedparser.parse(url)
         print(f"DEBUG: API Response - {feed.entries}")
 
         papers = []
-        
         for entry in feed.entries:
             papers.append({
                 "title": entry.title,