Need help in NGINX configuration

Hi All,

OS: RHEL 6.9
NGINX Version: 1.14.1

Using NGINX as a reverse proxy.

Till now, frontend and backend are hosted both on same port(5050)
Now, we created a new frontend developed from internal, we would like to host that on port 443, but the backend is still old and we create a copy which is hosted in port 8443, therefore we need two endpoints for our tests: from xxx.nginx-services.com redirects to abcd.domain.local
and from xxx.nginx-services.com:8443 redirects to abcd.domain.loca:8443

Could someone please help me with configuration changes that needs to done to achieve the above requirement?

Thanks in Advance!
SCR