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Drupal in subdirectory behind reverse proxy

pl flag
Arild

On my public-facing host, Apache works as reverse proxy to a non-public host, where a Drupal 9 instance is symlinked under the web root. Drupal answers to requests, but it outputs any local links with the symlink name included. Apparently because the PHP request variable $_SERVER['SCRIPT_NAME'] includes it.

How do I tell Drupal about it's "actual" base path?

The details

Public host config:

<Location "/">
  ProxyPreserveHost on
  ProxyPassReverse "https://otherserver/webb/"
</Location>

On otherserver, my domain example.com is a virtual host with its root in /var/www/sites/example.com/html. There is this symlink webb, pointing to the Drupal location:

/var/www/sites/example.com/html/webb -> /var/www/sites/example.com/html/drupal8/web/

Drupal responds, but in the response HTML, a link that should be to /about is instead to /webb/about, and the same goes for assets, etc.

If I echo $_SERVER['SCRIPT_NAME'], I get /webb/index.php.

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vidarlo avatar
ar flag
vidarlo
This may [be a better fit at the Drupal SE](https://drupal.stackexchange.com).
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pl flag
Arild

I fixed this by altering REQUEST_URI and SCRIPT_NAME in settings.php:

$trim_path = '/webb';
if (isset($GLOBALS['request'])) {
  $request = $GLOBALS['request'];
  if ($request->server->get('SCRIPT_NAME') == "$trim_path/index.php") {
    $request->server->set('SCRIPT_NAME', '/index.php');
    $request_uri = substr($request->server->get('REQUEST_URI'), strlen($trim_path));
    $request->server->set('REQUEST_URI', $request_uri);
  }
}

Kudos to lightsurge for the earliest mention of this idea that I could find.

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