I was getting the same error until I switched “Content Type” to application/json
ezrafree
1

It was already set to application/json.

I think I figured it out, though. This chatbot only supports certain Github events. It does work for push events, but does not work for tag creation or release events, which is what I was trying to use it for. (Having it post a message for every push is way too chatty for me.)

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