Merged REQUEST and ENVIRONMENT into REQUEST

renamed ENVIRONMENT_NAMES into META_NAMES
better usage of READABLE_STRING_GENERAL, and other strings
abstract RESPONSE_BUFFER in implementation of EWSGI
for the implementation, inheriting from deferred specification (more to come later)

library/server/request/router/src/context/request_handler_context.e

@@ -28,9 +28,9 @@ feature -- Access
 			s: detachable STRING
 			i,n: INTEGER
 		do
-			Result := request.environment.content_type
+			Result := request.content_type
 			if Result = Void then
-				s := request.environment.http_accept
+				s := request.http_accept
 				if s /= Void then
 					if attached accepted_content_types (request) as l_accept_lst then
 						from
@@ -61,18 +61,18 @@ feature -- Access
 
 feature -- Query	
 
-	path_parameter (a_name: STRING): detachable STRING_32
+	path_parameter (a_name: STRING): detachable READABLE_STRING_32
 			-- Parameter value for path variable `a_name'
 		deferred
 		end
 
-	query_parameter (a_name: STRING): detachable STRING_32
+	query_parameter (a_name: STRING): detachable READABLE_STRING_32
 			-- Parameter value for query variable `a_name'	
 			--| i.e after the ? character
 		deferred
 		end
 
-	parameter (a_name: STRING): detachable STRING_32
+	parameter (a_name: STRING): detachable READABLE_STRING_32
 			-- Any parameter value for variable `a_name'
 			-- URI template parameter and query parameters
 		do

library/server/request/router/src/context/request_uri_handler_context.e

@@ -27,7 +27,7 @@ feature -- Query
 		do
 		end
 
-	query_parameter (a_name: STRING): detachable STRING_32
+	query_parameter (a_name: STRING): detachable READABLE_STRING_32
 		do
 			Result := request.parameter (a_name)
 		end

library/server/request/router/src/context/request_uri_template_handler_context.e

@@ -31,12 +31,12 @@ feature -- Access
 
 feature -- Query	
 
-	path_parameter (a_name: STRING): detachable STRING_32
+	path_parameter (a_name: STRING): detachable READABLE_STRING_32
 		do
 			Result := uri_template_match.url_decoded_path_variable (a_name)
 		end
 
-	query_parameter (a_name: STRING): detachable STRING_32
+	query_parameter (a_name: STRING): detachable READABLE_STRING_32
 		do
 			Result := uri_template_match.url_decoded_query_variable (a_name)
 			if Result = Void then