This activity receives html content from specified url and stores it in variable. Both http and https requests are supported. Activity impersonates SharePoint account when getting request.
SharePoint Workflow Designer Phrase
Receive HTML content from this url and store in Variable: variable
|this url||Web url. Ex: http://mysite/default.aspx|
Also, you can use this activity to post SMS (SMS Gateways supports SMS gateway via HTTP/S) or call web service method.