Solved by agray in post #5 
              
              
                My nginx server stanza looks like this.  Maybe try putting the proxy_set… params outside of your location {…} stanzas. 
server {
  listen       443 ssl;
  server_name  localhost;
  
  ssl_certificate C:/.../nginx/conf/certificate.pem;
  ssl_certificate_key C:/.../nginx/conf/key.pem;
  
  proxy_http…