haproxy config with separate /path

[stephenjamieson]

Hope this helps someone:

frontend

# if the path starts with /zwavejsui send to the zwave-js-ui backend
use_backend zwavejsui if { path -i -m beg /zwavejsui }

backend

backend zwavejsui
  server zwavejsui0 zwavecontainer:8091 check inter 3s fall 5 rise 5
  option forwardfor
  # Add header for zwave-js-ui
  http-request add-header X-External-Path /zwavejsui
  # Remove /zwavejsui from path before proxying to backend
  http-request replace-path /zwavejsui(/)?(.*) /\2