This is mostly due to a server-side redirect. If Postman receives a 301 or 302 response code, it will automatically follow the redirect. Similar to the behaviour in browsers, the original request method will NOT be preserved, and the redirected request will be made with a GET method. If you want to disable the auto-follow redirect behaviour, or if you have other questions regarding this, please review the relevant documentation on redirects here.
I sent a POST request, but Postman seems to be sending a GET request.
