title: simple nginx reverse proxy seems to strip some headers
body: <p>I am a beginner at nginx.  I have a simple webserver on 8080 that I want to pass all traffic to in this rather small environment.  My proxy seems to work except that a custom header is not there when it gets to my upstream server.  The server block is below.  What would I need to add to this to keep my custom header?  In this case the custom header was set in angularjs but I don't think that has anything to do with it as it works fine going directly to 8080 on the server.  ($httpProvider.defaults.headers.common['GH_client'] = client_id();)</p>
  
  <pre><code>server {
  server_name localhost;
  
  location / {
          proxy_pass      http://localhost:8080;
          proxy_redirect  off;
      proxy_pass_header X-CSRF-TOKEN;
          proxy_set_header   Host             $host;
          proxy_set_header   X-Real-IP        $remote_addr;
          proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
          proxy_set_header   X-NginX-Proxy true;
  }}
  </code></pre>
  
  <p>Thanks for any help. </p>