Haproxy + Bitwarden

Hello,

i already use haproxy for my Jira and Confluence and Ownlcloud.

For example Jira it’s https://my.example.com/jira, for confluence https://my.example.com/confluence.

I would to use https://my.example.com/bitwarden for bitwarden but i did the same config but when i try i arrive with a page with

400 Bad Request
The plain HTTP request was sent to HTTPS port
nginx

Anybody have an example of config? Thank you