[tutorial Rougail 1.1] advanced hostname variable

Proxy configuration
===================

Modify the "host" variable

Examples of Ops inventory file
==============================

1/ VALID:

---
env_proxy:
  host: proxy.example.net

2/ INVALID, host is null:

---
env_proxy:
  host:

3/ INVALID, host is an integer:

---
env_proxy:
  host: 1

4/ INVALID but only for rougail:

---
env_proxy:
  host: the proxy

Rougail/socle/03-proxy.yml

@@ -1,4 +1,18 @@
 ---
 version: '1.0'
 env_proxy:
+  description: HTTP(s) proxy server overview and configuration
+  help: |
+    A proxy server acts as an intermediary gateway between a client and another
+    HTTP(s) server, such as the Internet.
+
+    It makes service requests on behalf of a local client and allows the client
+    to make network connections to network services outside its own network.
   host:
+    description: The proxy server’s address
+    help: |
+      Specifies the hostname of proxy server to enable proxy server access to
+      all of your HTTP(s) requests.
+    type: domainname
+    test:
+      - proxy.silique.fr