Update CGI parity notes

Change-Id: If8fdf8fd3cb2455835c04a7e475aa5e187b92b02

cgi_parity.markdown

@@ -5,24 +5,52 @@ We need to make sure that all features provided by these CGI variables are avail
 ## Server specific variables:
 
  - `SERVER_SOFTWARE` — name/version of HTTP server.
+   process.server_software = "Luvit"
+   process.version = "v0.1.0"
+
  - `SERVER_NAME` — host name of the server, may be dot-decimal IP address.
+   depends on which interface the server is bound to and from who's point of view.
+   ???  This is very useful though.  The "Host" header in the request usually has this too
+
  - `GATEWAY_INTERFACE` — CGI/version.
+   not needed, this is not CGI
 
 ## Request specific variables:
 
  - `SERVER_PROTOCOL` — HTTP/version.
+   `req.version_major`, `req.version_minor`
+
  - `SERVER_PORT` — TCP port (decimal).
+   ?
+
  - `REQUEST_METHOD` — name of HTTP method (see above).
+   req.method
+
  - `PATH_INFO` — path suffix, if appended to URL after program name and a slash.
+
  - `PATH_TRANSLATED` — corresponding full path as supposed by server, if `PATH_INFO` is present.
+
  - `SCRIPT_NAME` — relative path to the program, like /cgi-bin/script.cgi.
+
  - `QUERY_STRING` — the part of URL after ? character. May be composed of *name=value pairs separated with ampersands (such as var1=val1&var2=val2…) when used to submit form data transferred via GET method as defined by HTML `application/x-www-form-urlencoded`.
+
  - `REMOTE_HOST` — host name of the client, unset if server did not perform such lookup.
+   will not implement, use dns library on request:getpeername().address
+
  - `REMOTE_ADDR` — IP address of the client (dot-decimal).
+   request:getpeername().address
+
  - `AUTH_TYPE` — identification type, if applicable.
+
  - `REMOTE_USER` used for certain `AUTH_TYPE`s.
+
  - `REMOTE_IDENT` — see ident, only if server performed such lookup.
+
  - `CONTENT_TYPE` — MIME type of input data if PUT or POST method are used, as provided via HTTP header.
+   NA, see headers
+
  - `CONTENT_LENGTH` — similarly, size of input data (decimal, in octets) if provided via HTTP header.
- - Variables passed by user agent (`HTTP_ACCEPT`, `HTTP_ACCEPT_LANGUAGE`, `HTTP_USER_AGENT`, `HTTP_COOKIE` and possibly others) contain values of corresponding HTTP headers and therefore have the same sense.
+   NA, see headers
 
+ - Variables passed by user agent (`HTTP_ACCEPT`, `HTTP_ACCEPT_LANGUAGE`, `HTTP_USER_AGENT`, `HTTP_COOKIE` and possibly others) contain values of corresponding HTTP headers and therefore have the same sense.
+   req.headers