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Wordpress ReverseProxy HTTPS

How to make  Wordpress use HTTPS scheme when behind a ReverseProxy

I host Dockerized Wordpress. That means there is a front ReverseProxy that terminates the SSL tunnel and Proxies the requests to the Dockerized Wordpress through clear HTTP.

When a Wordpress is queried through clear HTTP, it builds all its assets URLs with HTTP scheme.

I want the  Dockerized Wordpress to builds all its assets URLs with HTTPS scheme.

Set the header "X-Forwarded-Proto" to the "https" value

In order to achieve that, I have to fool it (to lie) and pretend it has been queried through  HTTPS instead of clear HTTP.

For that, on the Dockerized Apache, I have to artificially set the header "X-Forwarded-Proto" to the "https" value.

In the ".htaccess" I have to :

  # Artificially set "X-Forwarded-Proto" to "https"
  RequestHeader set X-Forwarded-Proto "https"
  RequestHeader set X-Forwarded-Port "443"
  
  # following is standard Wordpress htaccess rules
  RewriteEngine On
  RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
  RewriteBase /
  RewriteRule ^index\.php$ - [L]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule . /index.php [L]

And in the "wp-config.php" file:

$_SERVER['HTTPS'] = 'on';

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