Now WGI_RESPONSE.set_status_code (..) has a new argument to pass optional custom reason phrase.

This is a minor breaking change (but prior to the first release, so acceptable)
   And then it is now possible to precise a custom reason phrase (useful for 4xx and 5xx response)

At the WSF_RESPONSE level, the status code is now sent only when the header are sent.
thus, it is possible to change the status code as long as no header is sent.
(in the future, we should also try to delay the sending of headers)

Removed WGI_RESPONSE.put_header_lines (..) which was not used, and WGI is not meant to provide such user friendly features
Now this is available directly on WSF_RESPONSE

library/protocol/http/src/http_header.e

@@ -80,7 +80,7 @@ feature {NONE} -- Initialization
             loop
             	line := c.item
             	if not line.is_empty then
-            		if line[line.count] = '%R' then
+            		if line [line.count] = '%R' then
 						line.remove_tail (1)
             		end
 					add_header (line)