POST request turns into GET request

Question

I have a Rails 4.1 application with nginx and unicorn. Some of POST request are turn into GET request. I gues it\'s related my nginx config. Here is the previous question ab

Answer 1

server {
 server_name www.my-app.com
 return 301 $scheme://my-app.com$request_uri;
}

This unconditionally will throw a 301 to every request to www.my-app.com

If there is no other return 301 in config: Check that the form action (or ajax request) is NOT using www.my-app.com domain, but just my-app.com, so it's not rewrited.

If there are others 301 in the config (removed for the post) could be something different.