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/server/ewsgi/specification/response/wgi_response.e

@@ -49,15 +49,17 @@ feature -- Status setting
 		deferred
 		end
 
-	set_status_code (a_code: INTEGER)
-			-- Set response status code
+	set_status_code (a_code: INTEGER; a_reason_phrase: detachable READABLE_STRING_8)
+			-- Set response status code with custom `a_reason_phrase' if precised
 			-- Should be done before sending any data back to the client
 		require
+			a_code_positive: a_code > 0
 			status_not_set: not status_committed
 			header_not_committed: not header_committed
 		deferred
 		ensure
 			status_code_set: status_code = a_code
+			status_reason_phrase_set: status_reason_phrase = a_reason_phrase
 			status_set: status_is_set
 		end
 
@@ -66,6 +68,13 @@ feature -- Status setting
 		deferred
 		end
 
+	status_reason_phrase: detachable READABLE_STRING_8
+			-- Custom status reason phrase for the Response (optional)
+		deferred
+		ensure
+			Result /= Void implies status_is_set
+		end
+
 feature -- Header output operation
 
 	put_header_text (a_text: READABLE_STRING_8)
@@ -79,17 +88,7 @@ feature -- Header output operation
 		deferred
 		ensure
 			status_set: status_is_set
-			header_committed: header_committed
-			message_writable: message_writable
-		end
-
-	put_header_lines (a_lines: ITERABLE [TUPLE [name: READABLE_STRING_8; value: READABLE_STRING_8]])
-		require
-			status_set: status_is_set
-			header_not_committed: not header_committed
-		deferred
-		ensure
-			status_set: status_is_set
+			status_committed: status_committed
 			header_committed: header_committed
 			message_writable: message_writable
 		end

library/server/ewsgi/specification/stream/wgi_output_stream.e

@@ -62,10 +62,13 @@ feature -- Specific output
 
 feature -- Status writing
 
-	put_status_line (a_code: INTEGER)
+	put_status_line (a_code: INTEGER; a_reason_phrase: detachable READABLE_STRING_8)
 			-- Put status code line for `a_code'
+			-- with custom `a_reason_phrase' if precised
 			--| Note this is a default implementation, and could be redefined
 			--| for instance in relation to NPH CGI script
+		require
+			a_code_positive: a_code > 0
 		deferred
 		end