在api名称之后_post做了什么以及如果没有_post就能调用该服务怎么可能，即使它名字也是如此

I came across a tutorial where they're naming api function like public function signup_post()

But at the calling time they're just calling it via signupkeyword like this baseurl/signup in rest client and it works fine. How's that possible? What does that _post do?