check for url

app.py

@@ -36,6 +36,11 @@ else:
 
 
 html_content = st.text_input("Paste your piece of HTML here:", max_chars=10000)
+# check if html_content is an url, and show error if it is
+if html_content:
+    if html_content.startswith("http"):
+        st.write("Please paste the HTML piece code, not the URL")
+        html_content = None
 
 extract_button = st.button("Extract data format")