According to the new changes in the Streamlit URL formatting, any public Streamlit link can still be used in iframe by adding embedded=true as a parameter to the embedded URL. This works when there is only one parameter embedded=true is being added to the URL. However, with adding additional parameters to the URL like ?someparam=value&embedded=true will eventually lead to “… redirected you too many times” error.
Leave the page open and visible for at least 5 minutes or more. (in the Network tab you can notice calls to ... api/v1/app/status every 2 seconds)
Upon /api/v1/app/status or /api/v1/app/context returning any failure response, notice the page gets refreshed by redirecting the call through: https://share.streamlit.io/-/auth/app?redirect_uri=https%3A%2F%2Fstreamlit-example-app-ab-testing-streamlit-app-rmlvff.streamlitapp.com%2F%3Fsomeparam%3Dvalue&embedded=true
Next cals the https://streamlit-example-app-ab-testing-streamlit-app-rmlvff.streamlitapp.com/-/login?payload=…
Finally, returns back to the Streamlit app link: https://streamlit-example-app-ab-testing-streamlit-app-rmlvff.streamlitapp.com/?someparam=value but with missing embedded=true.