Create app.py

app.py

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+import os
+import random
+import streamlit as st
+import streamlit.components.v1 as components
+
+st.set_page_config(layout="wide")
+
+# Message for users
+st.markdown("""
+**Notice**: If you encounter any issues opening the demo or using the chatbot, try reloading the page which would reschedule a new demo instance. 
+Please report the issues [here](https://huggingface.co/spaces/mhan/Shot2Story/discussions/1).
+We will respond ASAP. 
+
+
+""")
+
+# List of backend URLs
+backends = ["backend1", "backend2"]
+
+# Randomly select a backend URL
+backend = random.choice(backends)
+backend_url = os.getenv(backend, "https://www.bytedance.com/en/")  # 如果环境变量不存在，则使用默认 URL
+
+iframe_html = f'<iframe src="{backend_url}" width="100%" height="800"></iframe>'
+
+components.html(iframe_html, height=800)