I am trying to host a Streamlit app on Azure Compute Instance resource.
It appears that accessing the instance is possible through https://{instanceName}-{internalPort}.northeurope.instances.azureml.ms (with an Azure-provided security layer in between).
To smoketest this I created a simple Flask app and verified I could access it: I was able to access my dummy app on https://[REDACTED]-5000.northeurope.instances.azureml.ms/.
Attempt 1: Basic Configuration
Now I want to serve my Streamlit app. Initially I wanted to eliminate error sources and simply check if wires are connected correctly, and my app is simply:
import streamlit as st
st.title("Hello, World!")
Running this streamlit app (streamlit run sl_app.py) gives:
2022-03-28 11:49:38.932 Trying to detect encoding from a tiny portion of (13) byte(s).
2022-03-28 11:49:38.933 ascii passed initial chaos probing. Mean measured chaos is 0.000000 %
2022-03-28 11:49:38.933 ascii is most likely the one. Stopping the process.
You can now view your Streamlit app in your browser.
Network URL: http://[REDACTED]:8501
External URL: http://[REDACTED]:8501
Trying to access this through https://[REDACTED]-8501.northeurope.instances.azureml.ms/ I can access the app, but the "Please wait..." indicator appears indefinitely:
Attempt 2: Updated Streamlit Config
Inspired by App is not loading when running remotely Symptom #2 I created a Streamlit config.toml with a reconfiguring of server/browser access points, and ended up with the following:
[browser]
serverAddress = "[REDACTED]-8501.northeurope.instances.azureml.ms"
serverPort = 80
gatherUsageStats = false
[server]
port = 8501
headless = true
enableCORS = false
enableXsrfProtection = false
enableWebsocketCompression = false
Running the app now gives:
You can now view your Streamlit app in your browser.
URL: http://[REDACTED]-8501.northeurope.instances.azureml.ms:80
However, I still get the infinite Please wait-indicator. Diving a little bit deeper reveals something related to a wss stream? Whatever that is?
I suspect that what I'm seeing is due to the fact that Azure automatically pipes my request from http:// to https://, and this for some reason rejects the stream component that Streamlit uses?
Note: Various IP addresses and hostnames are REDACTED for the sake of security :-)
