Change headers in nginx to work with django allowed_hosts

playbooks/roles/mlapi/templates/default.j2

@@ -2,6 +2,11 @@ server {
     listen {{nginx_listen_port}};
     server_name localhost;
 
+    set $my_host $http_host;
+    if ($host ~ "\d+\.\d+\.\d+\.\d+") {
+        set $my_host "127.0.0.1";
+    }
+
     # https://docs.djangoproject.com/en/dev/howto/static-files/#serving-static-files-in-production
     location /static/ { # STATIC_URL
         alias {{ml_api_dir}}/staticfiles/;
@@ -18,7 +23,7 @@ server {
         proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
         proxy_set_header X-Forwarded-Port $http_x_forwarded_port;
         proxy_set_header X-Forwarded-For $http_x_forwarded_for;
-        proxy_set_header Host $http_host;
+        proxy_set_header Host $my_host;
 
         proxy_pass http://127.0.0.1:7999;
     }