Why does nginx rewrite sending https to http?

[Kevin]

Hi,

I'm trying to rewrite some route in cloud foundry static buildpack, but
whenever I rewrite, the https goes to http.

So I add return with / with /login, then it goes to http://server/, even it
starts with https://server/login.


location /login {
      return 301 /;

      <% if ENV["FORCE_HTTPS"] %>
        if ($http_x_forwarded_proto != "https") {
          return 301 https://$host$request_uri;
        }
      <% end %>
 }
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