Nginx, proxy_pass not working with domain name

I'm trying to redirect my domain url to my local server.

For some reason it work with the localhost (mapping from http://localhost/ to http://127.0.0.1:5000 works), but I can't make it working with my domain name (http://www.example.com)

Here's my nginx conf:

    ...
server {

        listen       80;
        server_name  www.example.com localhost;

        location / {
           proxy_pass http://127.0.0.1:5000;
           proxy_set_header Host $host;
        }
    }
...

Is there's something I am missing?

edit

It seems that the problem was about the reolution of 0.0.0.0, localhost and 127.0.0.1 . Rewriting my proxy_pass to http://0.0.0.0:5000 did the trick. Inversely with my server as long as it match exactly the nginx conf.

My error was because I thought 0.0.0.0 / 127.0.0.1 / was interchangeable. Thanks for your help.