Octane Laravel welcome page

[fpolli]

Hi, I started my Octane server and on every request, the browser receives a plain text response:
"This is the Laravel welcome page."
I don't know why and I want to find the place where that response is generated so I can add some diagnostic information to the response, but I cannot find that string anywhere in my installation folder. I have searched in VS Code in my project root, and also in the Octane folder under vendor.

Can anyone tell me what file this response comes from?