The controller does not contain an http server. You can use stokercloud, or if you want a local solution then you could use pellmon eg. on a raspberry or any old pc with linux, or in a virtual machine running linux on your windows pc.
Pellmon contains a webserver where you can GET settings with eg:
GET /pellmon/getparam/boiler-temp
which return the JSON data:
value "65"
param "boiler-temp"
and change settings with POST, eg:
POST /pellmon/setparam/alarm-max_shaft_temp
with params:
data: "50"
setparam/ requires a logged in user, so you need to POST username and password to /pellmon/auth/login and keep track of the session_id cookie.
Another option would be to set up a webserver pretending to be stokercloud, and a dns server to fool the burner to talk to your 'stokercloud' instead of the real one. But that's a lot of trouble and won't ever be nearly as good as just using the existing nice and fast UDP protocol.