• Need help mapping below into HAProxy backend:

    acl existing-x-forwarded-host req.hdr(X-Forwarded-Host) -m found
    http-request add-header X-Forwarded-Host %[req.hdr(Host)]/documentserver-virtual-path unless existing-x-forwarded-host
    reqrep ^([^\ :])\ /documentserver-virtual-path/(.) \1\ /\2
    server onlyoffice-documentserver backendserver-address:80