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

User can not get right query_params before rerun.

Reproducible Code Example

import streamlit as st

st.experimental_set_query_params(param=3)
st.write(st.experimental_get_query_params())

Steps To Reproduce

Run script, {"param ": 3} will not appear at first time until rerun script after querystring in browser already changed.

Expected Behavior

Show {"param ": 3}

Current Behavior

show empty dict

Is this a regression?

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

Debug info

• Streamlit version: 1.20.0
• Python version: 3.10.6
• Operating System: Linux
• Browser: Chrome
• Virtual environment: None

Additional Information

In previous version set_query_params will set ctx.query_string = parse.urlencode(query_params, doseq=True) immediately.

But in 1.20, this line is removed while get_query_params still get if from ctx.query_string .

Are you willing to submit a PR?

• Yes, I am willing to submit a PR!