Sending HTTP requests with curl command

Syntax : curl –parameter(s) http://website/adress

Content of a web page : curl http://website/adress

Parameters of the request : curl –head http://website/adress

Change a parameter to access to pages non-authorized being a visitor :
curl -H “parameter:valuehttp://website/address

Connection with the username and password :
curl -u username:password http://website/adress