URL issue with http proxy

[PJ-DSI-DevOps]

Hello,

When using this plugin behind a reverse proxy with path, the urls generated by "url_for" doesn't work as expected anymore. We end up having a path that look like /{LANG}/{PATH}/foo instead of /{PATH}/{LANG}/foo.

The method used to set the reverse proxy path is taken from this blog post : https://mojolicious.io/blog/2019/03/18/reverse-proxy-with-path/

Here is a small app to reproduce the problem :

use Mojolicious::Lite -signatures;

plugin I18N => {namespace => 'MyApp::I18N', support_url_langs => [qw(en fr)]};

if ( my $path = $ENV{MOJO_REVERSE_PROXY} ) {
    my @path_parts = grep /\S/, split m{/}, $path;
    app->hook( before_dispatch => sub ($c) {
        my $url = $c->req->url;
        my $base = $url->base;
        push @{ $base->path }, @path_parts;
        $base->path->trailing_slash(1);
        $url->path->leading_slash(0);
    });
}

get '/' => sub ($c) {
  $c->render(text => $c->url_for('/foo'));
};

app->start;

Then :

MOJO_REVERSE_PROXY="/myapp" ./base_i18n.pl get /fr/
/fr/myapp/foo

And i was expecting /myapp/fr/foo.