Start create or edit action.

• Select $Url context object (1).
• Select item from context object items picklist (2).

$Url context object items:

• FullUrl - URL itself (http://www.somedb.com/index.html).
• Protocol - protocol used for retrieval (either http or https).
• Host - fully qualified domain name of a network host.
• Path - the portion of the URL from a slash (/) following the origin up to the query or fragment. 
• Port - number used to identify a specific web server at the provided host name.
• Query - the portion of the URL from the first question mark (?) following the path up to the fragment. 
• Ref - reference URL.
• Params - key-value pairs of URL parameters (stores string in a following format: '{11=22, 33=44}').