Update app.py

app.py

@@ -147,9 +147,12 @@ def analyze_pdf_novelty(patent_background, pdf_url):
     try:
         # Disable SSL warnings
         urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
-        
+        headers = {
+            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36",
+            "Accept": "application/pdf"
+        }
         # Download PDF
-        response = requests.get(pdf_url, timeout=10, verify=False)
+        response = requests.get(pdf_url, headers=headers, timeout=10, verify=False)
         if response.status_code != 200:
             return {"error": f"Failed to download PDF (status code: {response.status_code})"}