I'm running a dyno for my Heroku ws and express server, but I have the response code 426 everytime I try to reach the express server. Event when I click on the "open app" to open in by browser, I have the same error message.
I'm running the client on Unity with UnityWebRequest and WebsocketSharp. I tried to add request headers but none on the ones I tried (eveything that chatGPT told me) worked. Surprysingly, the WebSocket is working perfectly.
I used to run heroku express before and everything was working, I changed nothin to my code.
Any ideas ?
Tried with all HTTP/REST, POST AND GET libs available on unity. The problem also happens on web browser.