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OVHcloud Load Balancer - HTTP Header

Stephanie R.
Updated

Introduction

With any front-end service like CDN or IP Load balancing in front of your services, the IP of your clients is hidden by this service.

You'll only see the private IP in your log, and we'll fix this.

10.108.0.15 - - [22/Mar/2017:10:56:47 +0100] "GET / HTTP/1.1" 200 706 "-" "Mozilla/5.0 (Linux[...]"
10.108.0.24 - - [22/Mar/2017:10:56:47 +0100] "GET / HTTP/1.1" 200 706 "-" "Mozilla/5.0 (Linux[...]"

 

Warning

You need to restrict access to your web services from the OVHcloud Load Balancer.

With this API call you can get IP Range of your servers:

GET /ipLoadbalancing/{serviceName}/natIp

NOTE: The code snippets below are samples and may require you to make adjustments.

 

Headers

X-Forwarded-For

The following header should be inside the IP of your client.

Apache

LogFormat "%{X-Forwarded-For}i-%h- %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" loadbalancing
CustomLog /chemin/fichier.log loadbalancing

 

Nginx

log_format "%{X-Forwarded-For}i-%h- %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" loadbalancing
access_log /chemin/fichier.log loadbalancing

 

X-Forwarded-Proto

You can also get the scheme used by your client to reach the OVHcloud Load Balancer. This is helpful to redirect HTTP to HTTPS.

Apache

With htaccess, you can redirect your customers in HTTPS.

RewriteEngine on
RewriteCond %{HTTP:X_Forwarded_Proto} !https
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

 

Nginx (best)

With Nginx, it's best to use a entire VHost to redirect HTTP to HTTPS.

server {
        listen [::]:80 default_server;
        listen 80 default_server;
        server_name _;
        root /var/www/;
        location / {
                return 301 https://$server_name$request_uri;
        }
}

 

Send headers to PHP

Apache

Header set REMOTE_ADDR %{HTTP:X_Forwarded_Proto}

 

Nginx

With RealIP module.

real_ip_header X-Forwarded-For;
set_real_ip_from 10.108.0.0/14;

 

Go further

For more information and tutorials, please see our other OVHcloud Load Balancer guides or explore the guides for other OVHcloud products and services.

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