If-Match implemented in skeleton handler

library/server/wsf/src/wsf_request.e

@@ -1048,6 +1048,42 @@ feature -- HTTP_*
 			Result := wgi_request.http_if_match
 		end
 
+	http_if_modified_since: detachable READABLE_STRING_8
+			-- Modification check on resource
+		do
+			Result := wgi_request.http_if_modified_since
+		end
+
+	http_if_none_match: detachable READABLE_STRING_8
+			-- Existence check on resource
+		do
+			Result := wgi_request.http_if_none_match
+		end
+
+	http_if_range: detachable READABLE_STRING_8
+			-- Range check on resource
+		do
+			Result := wgi_request.http_if_range
+		end
+
+	http_if_unmodified_since: detachable READABLE_STRING_8
+			-- Modification check on resource
+		do
+			Result := wgi_request.http_if_unmodified_since
+		end
+
+	http_last_modified: detachable READABLE_STRING_8
+			-- Modification time of resource
+		do
+			Result := wgi_request.http_last_modified
+		end
+
+	http_range: detachable READABLE_STRING_8
+			-- Requested byte-range of resource
+		do
+			Result := wgi_request.http_range
+		end
+
 feature -- Extra CGI environment variables
 
 	request_uri: READABLE_STRING_8