Error installing SequenceServer behind a nginx reverse proxy

Hi,
I’am experiencing troubles after installing SequenceServer on a server (either raw install or docker container) behind a reverse proxy server (see below for the error message).
Install is working perfectly directly on the server without proxy…

I modified nginx file configuration as indicated in “advanced configuration” and " Reverse proxy setup with Nginx" but it is still not working.

Any help will be appreciated.

Thank you by advance.

Dump of error :
“{“message”:“GET /sequenceserver/”,“title”:“Sinatra::NotFound”,“more_info”:”/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1090:in route_missing'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1037:in route!’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1033:in route!'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1140:in block in dispatch!’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1112:in block in invoke'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1112:in catch’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1112:in invoke'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1135:in dispatch!’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:949:in block in call!'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1112:in block in invoke’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1112:in catch'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1112:in invoke’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:949:in call!'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:938:in call’\n/var/lib/gems/2.7.0/gems/rack-2.2.4/lib/rack/deflater.rb:44:in call'\n/var/lib/gems/2.7.0/gems/rack-2.2.4/lib/rack/head.rb:12:in call’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:218:in call'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1993:in call’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1553:in block in call'\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1769:in synchronize’\n/var/lib/gems/2.7.0/gems/sinatra-2.2.1/lib/sinatra/base.rb:1553:in call'\n/var/lib/gems/2.7.0/gems/sequenceserver-2.0.0/lib/sequenceserver.rb:110:in call’\n/var/lib/gems/2.7.0/gems/rack-2.2.4/lib/rack/handler/webrick.rb:95:in service'\n/usr/lib/ruby/2.7.0/webrick/httpserver.rb:140:in service’\n/usr/lib/ruby/2.7.0/webrick/httpserver.rb:96:in run'\n/usr/lib/ruby/2.7.0/webrick/server.rb:307:in block in start_thread’"}"