[cache] Initial import of the cache guide re-worked.

Author: weaverryan

glossary.rst

@@ -42,4 +42,14 @@ Glossary
  the services. The service container takes care of lazily instantiating
  and injecting dependent services.
 
+ HTTP Specification
+ The *Http Specification* is a document that describes the Hypertext
+ Transfor Protocol - a set of rules laying out the classic client-server
+ request-response communication. The specification defines the format
+ used for a request and response as well as the possible HTTP headers
+ that each may have. For more information, read the `Http Wikipedia`_
+ article or the `HTTP 1.1 RFC`_.
+
 .. _`service-oriented architecture`: http://wikipedia.org/wiki/Service-oriented_architecture
+.. _`HTTP Wikipedia`: http://www.w3.org/Protocols/rfc2616/rfc2616.html
+.. _`HTTP 1.1 RFC`: http://www.w3.org/Protocols/rfc2616/rfc2616.html