Added basic support for "Expect" http header

i.e:   WSF_REQUEST.http_expect: detachable READABLE_STRING_8

Added WSF_REQUEST.request_time_stamp: INTEGER_64

library/server/ewsgi/specification/request/wgi_meta_names.e

@@ -44,6 +44,8 @@ feature -- Access
 
 	http_connection: STRING = "HTTP_CONNECTION"
 
+	http_expect: STRING = "HTTP_EXPECT"
+
 	http_referer: STRING = "HTTP_REFERER"
 
 	http_transfer_encoding: STRING = "HTTP_TRANSFER_ENCODING"

library/server/ewsgi/specification/request/wgi_request.e

@@ -559,6 +559,12 @@ feature -- HTTP_*
 		deferred
 		end
 
+	http_expect: detachable READABLE_STRING_8
+			-- The Expect request-header field is used to indicate that particular server behaviors are required by the client.
+			-- Example: '100-continue'.
+		deferred
+		end
+
 	http_host: detachable READABLE_STRING_8
 			-- Contents of the Host: header from the current request, if there is one.
 		deferred

library/server/ewsgi/src/implementation/wgi_request_from_table.e

@@ -196,6 +196,13 @@ feature -- Access: HTTP_* CGI meta parameters - 1.1
 			Result := meta_string_variable ({WGI_META_NAMES}.http_connection)
 		end
 
+	http_expect: detachable READABLE_STRING_8
+			-- The Expect request-header field is used to indicate that particular server behaviors are required by the client.
+			-- Example: '100-continue'.
+		do
+			Result := meta_string_variable ({WGI_META_NAMES}.http_expect)
+		end
+
 	http_host: detachable READABLE_STRING_8
 			-- Contents of the Host: header from the current request, if there is one.
 		do

library/server/wsf/src/wsf_request.e

@@ -911,6 +911,13 @@ feature -- HTTP_*
 			Result := wgi_request.http_connection
 		end
 
+	http_expect: detachable READABLE_STRING_8
+			-- The Expect request-header field is used to indicate that particular server behaviors are required by the client.
+			-- Example: '100-continue'.
+		do
+			Result := wgi_request.http_expect
+		end
+
 	http_host: detachable READABLE_STRING_8
 			-- Contents of the Host: header from the current wgi_request, if there is one.
 		do
@@ -965,13 +972,26 @@ feature -- Extra CGI environment variables
 
 	request_time: detachable DATE_TIME
 			-- Request time (UTC)
+		local
+			i: like request_time_stamp
+		do
+			i := request_time_stamp
+			if i > 0 then
+				Result := date_time_utilities.unix_time_stamp_to_date_time (i)
+			end
+		end
+
+	request_time_stamp: INTEGER_64
+			-- Request time stamp (UTC)	 (unix time stamp)
 		do
 			if
 				attached {WSF_STRING} meta_variable ({WSF_META_NAMES}.request_time) as t and then
 				t.value.is_integer_64
 			then
-				Result := date_time_utilities.unix_time_stamp_to_date_time (t.value.to_integer_64)
+				Result := t.value.to_integer_64
 			end
+		ensure
+			Result = 0 implies meta_variable ({WSF_META_NAMES}.request_time) = Void
 		end
 
 feature -- Cookies