Ensure that PATH_INFO and REQUEST_URI are following the CGI specifications:

- PATH_INFO is percent decoded but still utf-8 encoded,
  this is available via WGI.path_info and WSF_REQUEST.utf_8_path_info.
- Added WSF_REQUEST.percent_encoded_path_info
- and WSF_REQUEST.path_info remains the unicode value for PATH_INFO

Added cgi_variables: WGI_REQUEST_CGI_VARIABLES to have a simple and quick view on CGI variables
Added execution_variables to be able to iterate on execution variables.
Added PERCENT_ENCODER.percent_decoded_utf_8_string
Improved the WSF_DEBUG_HANDLER to provide more information thanks to WSF_DEBUG_INFORMATION object.

library/server/ewsgi/connectors/nino/src/wgi_nino_handler.e

@@ -74,8 +74,8 @@ feature -- Request processing
 			l_request_uri := a_handler.uri
 			l_headers_map := a_handler.request_header_map
 			create e
+			create enc
 			if attached e.starting_environment as vars then
-				create enc
 				create env.make_equal (vars.count)
 				across
 					vars as c
@@ -168,8 +168,22 @@ feature -- Request processing
 					if p > 0 then
 						l_path_info.keep_head (p - 1)
 					end
-					env.force (l_path_info, "PATH_INFO")
+					env.force (enc.decoded_utf_8_string (l_path_info), "PATH_INFO")
 					env.force (l_base, "SCRIPT_NAME")
+				else
+						-- This should not happen, this means the `base' is not correctly set.
+						-- It is better to consider base as empty, rather than having empty PATH_INFO
+					check valid_base_value: False end
+
+					l_path_info := l_request_uri
+					p := l_request_uri.index_of ('?', 1)
+					if p > 0 then
+						l_path_info := l_request_uri.substring (1, p - 1)
+					else
+						l_path_info := l_request_uri.string
+					end
+					env.force (enc.decoded_utf_8_string (l_path_info), "PATH_INFO")
+					env.force ("", "SCRIPT_NAME")
 				end
 			end