app.py

import gradio as gr
import random

src_list = ['https://api.zmkj.site/', 'https://api1.zmkj.site/']

with gr.Blocks() as demo:
    gr.HTML(f"""
    <iframe 
        src="{random.choice(src_list)}" 
        width="100%" 
        height="500"
        frameborder="0"
        allow="fullscreen"
    ></iframe>
    """)

demo.launch()