HTTP command

with domiticz I manage to send a command BASH to my romba in wifi (roowifi) … I can not do the same thing with homey and HTTP request flow, can you help it?
the domoticz bash is:
curl --user admin:roombawifi

Use this tool to generate a Header which you need to send in your request:

Hello Emile,
do not know how to fill the request with http request, to send my order I have to do what: Get? GET JSON? Get query? other?

how to complete the application:
on 1 line?
and how to fill with the cryppage of the username and password?

thank you for your help,
there is no tutorial?