[nextcloud-web] Remove ::ffff: from X-Forwarded-For (possible cause of the throttling we are seeing

[Andrea Veri <averi src gnome org>]

commit 2a9139ed80a7b97427909dec2eb04baca6cfc3bf
Author: Andrea Veri <averi redhat com>
Date:   Tue Jun 22 16:24:16 2021 +0200

    Remove ::ffff: from X-Forwarded-For (possible cause of the throttling we are seeing

 nginx/nginx.conf | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index 554ce9f..eab307a 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -27,6 +27,11 @@ http {
     server localhost:9000;
   }
 
+  map $proxy_add_x_forwarded_for $custom_x_forwarded_for {
+    default $proxy_add_x_forwarded_for;
+    ^::ffff: '';
+  }
+
   server {
     listen              *:8443 ssl;
     listen              [::]:8443 ssl;
@@ -40,6 +45,9 @@ http {
     set_real_ip_from 10.0.0.0/8;
     real_ip_header X-Forwarded-For;
 
+    # Prevent X-Forwarded-For to include ::ffff:
+    proxy_set_header X-Forwarded-For $custom_x_forwarded_for;
+
     # Add headers to serve security related headers
     # Before enabling Strict-Transport-Security headers please read into this
     # topic first.