I am setting the destination property in af:link tag as shown below
<af:link destination="#{row.Url}" rendered="#{row.DataType == 'Web Page'}" text="Link" id="l1" targetFrame="_blank" >
</af:link>
#{row.Url} is a value something like this -> www.google.com
But when I click on the link the it appends to the browser URL as shown below
.....-context-root/faces/main/www.google.com