Checklist

• I have searched the existing issues for similar issues.
• I added a very descriptive title to this issue.
• I have provided sufficient information below to help reproduce this issue.

Summary

When running a steamlit server, the icon cannot fetch (404).

Reproducible Code Example

import streamlit as st


if __name__ == "__main__":
    st.set_page_config(
        page_title="wocao",
        page_icon="random",
        layout="wide",
        initial_sidebar_state="expanded",
    )
    
    x = st.slider("Select a value")
    st.write(x, "squared is", x * x)

Steps To Reproduce

streamlit run demo.py

Expected Behavior

Show the icon I selected or random

Current Behavior

Cannot show the icon but a blank icon

Is this a regression?

• Yes, this used to work in a previous version.

Debug info

• Streamlit version: 1.17.0
• Python version: 3.7.12
• Operating System: Ubuntu 20
• Browser: Edge
• Virtual environment: Conda

Additional Information

No response

Are you willing to submit a PR?

• Yes, I am willing to submit a PR!