I have a Python web service deployed, and it needs to be able to handle incoming Slack messages sent to endpoint /api/slack. However, the POST requests never get through and I get the error message “your URL didn’t respond with the value of the challenge parameter” in Slack. It works just fine when I’m testing locally but whenever I deploy it to Render it won’t work. Is Render perhaps blocking this type of request from coming through and, if so, how do I fix it? Thanks.
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For others who experience this issue, I had to bind the service to 0.0.0.0 instead of the default 127.0.0.1 by adjusting the startup command. Slack is now able to communicate to my app.
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