Nginx does redirect, not proxy

I want to set up Nginx as a reverse proxy for a https service, because we have a special usecase where we need to "un-https" a connection:

http://nginx_server:8080/myserver ==> https://mysecureservice

But what happens is that the actual https service isn't proxied. Nginx does redirect me to the actual service, so the URL in the browser changes. I want to interact with Nginx as it was the actual service, just without https.

This is what I have:

server {    listen 0.0.0.0:8080 default_server;    location /myserver {        proxy_pass https://myserver/;        proxy_set_header X-Real-IP  $remote_addr;        proxy_set_header X-Forwarded-For $remote_addr;        proxy_set_header Host $host;    }}