!2 Test that HTTP links are rendered correctly
If a string of the form !-http://-!''some_url'' appears in wiki text, it is converted to a link.
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!3 Check the variables get rendered in links
 * First create a page with a variable and http link on it.
!|script|
|start|Page Builder|
|line|!define HOST {localhost:8081}|
|line|http://${HOST}/page||
|page|!-HttpLinkPage-!|

 * Then fetch the page.
|Response Requester.|
|uri|valid?|
|!-HttpLinkPage-!|true|

 * Then check that the link was properly rendered.
|Response Examiner.|
|type|pattern|matches?|value|
|contents|<a href=!-"http://localhost:8081/page"-!>!-http://localhost:8081/page-!</a>|true||